Naruto gets called out on this when he runs off after Yukimaru by himself in the Three-Tails arc, with Kakashi and Yamato reminding him of the impact his actions could have had on the mission, and Sakura punching Naruto into the ground so hard he makes a crater. He gets the very description of a Leeroy Jenkins by Akatsuki, especially when Sasori asks Itachi to describe Naruto to him.
Itachi:(to Sasori) The Nine-Tails is the one who screams and charges headfirst.
Sasuke's immediate response to seeing Itachi in Part I was charge at him with a Chidori, and he spends the rest of the fight furiously rushing at Itachi only to get beaten down repeatedly. The first time they meet in Part II, Itachi (who turns out to be a genjutsu) mockingly asks if Sasuke is going to run at him screaming like last time.
Shino follows Sasuke (who's pursuing Gaara in a Leeroy Jenkins move of his own, albeit in a loose interpretation of Genma's suggestion to make himself useful) in the Invasion of Konoha arc and ends up fighting Kankuro, whom he was disappointed to not be able to face in his official match.
Once, Sakura put her teammates to sleep with a special gas to face Sasuke alone, which did not work well and required Kakashi to save her. She later charged into Kakashi's fight with Sasuke to kill Sasuke herself, only to hesitate at the worst possible time and cause Naruto to rescue her from Sasuke... which ended up poisoning Naruto with her kunai.
Kouji Kabuto from Mazinger Z is a mild case of this. In one hand, he never listens when someone tells him "Don't go", he is impulsive and hard-headed, falls into utterly DUMB, anybody-could-have-seen-it traps because he is too hasty and eager (a fact Kouji himself lampshades), and he is a determinator has troubles to understand when quitting to fight. On the other hand, he IS capable of listen and follow instructions and plans, he is a Genius Ditz is good devising strategies on the fly, he is capable of deceiving the enemy and he understands sometimes is necessary and even good being stealth (although he is not very good at it, but at least he makes the attempt) or making a tactical retreat. And he is capable of acknowledging his mistakes (once he was forced to retreat. He was angry, but after The Professor Yumi explained the situation to him, he admitted he was wrong and apologized). In a nutshell, he shows some traits of the trope, but he has not let they get him killed.
General Scarabeth from Great Mazinger somehow manages combining this trope with The Chessmaster. He is the best tactician of the Mykene Empire, capable to create brilliant strategies and complete missions others had previously thought impossible. However he is also the more battle-thirsty commander, and he is prone to charge the enemy headfirst without waiting for his troops.
Rak from Tower of God. The test in question was designed so that one picked the right door. Koon is trying to work with what little clues they have been given, whereas Rak gathers that the scarcity of of clues was just another way of saying "Gamble!", so he kicked a random door down. This just proves how much of a fuck Rak doesn't give, since choosing the wrong door is penalized by death. Luckily, EVERY SINGLE DOOR was correct.
Luffy has pulled this stunt as illustrated in this video. It also worked for him because he is easily the strongest member of the Straw Hats, and to his credit freestyle fights against the Big Bads rather well but it backfired in the Punk Hazard arc. Luffy charges in and challenges the Big Bad of the arc despite his ally Trafalgar Law's warnings and plans, resulting in the crew's defeat and almost everyone being captured.
Though to be fair, he was winning that fight. The Big Bad just pulled out a rather creative application of his devil fruit powers that took out everyone with even a modicum of significant strength in the vicinity. Once Luffy was aware of it the villain didn't stand a chance.
Sanji pulls a Leeroy Jenkins in the Water 7 arc, when he goes off on his own to look for Robin and does it again when he decides to rescue her from the CP9 after boarding the Sea Train, despite Zoro warning him over the Den Den Mushi about the CP9's strength; he says that he would not obey any order given to hold back now that Robin needs to be saved. Incidentally, Luffy approved of this approach, and told Zoro he would have done the same thing as Sanji and proceeded to do so as soon as they arrived at Enies Lobby.
EveryGanmen pilot is one of these, and Leeron and Attenborough also display some characteristics of the trope ("HASHAAAAAAA") but when you're in a universe where everything, especially physics, is subservient to the Rule of Cool, this is the best tactic.
Kamina was the most prevalent example of this trope, and the other characters tried to make it clear that this was a very bad idea. Sure, he inspired everyone, but if Simon wasn't there to level things out, Kamina would've been dead by the end of the second episode (a fact Kamina reiterates several times). Granted, Kamina later tells Yoko that this show of bravado was simply a show to inspire Simon, so in that respect, it may have been the most brilliant tactic of all.Unfortunately, the one time he plans out a strategy to capture Thymilph's Dai-Gunzan, it ends up being the death of him. The rest of the Gunmen pilots are marginally more level-headed, but still incredibly bold.
Shinji charged straight at Samshiel despite his sliced off power cord, he was running out of power and out of ammo, and Misato was ordering him to retreat back to the base. He completely acted on impulse. Later he got arrogant and reckless and got himself imprisoned inside a 2-D Angel until Unit 01 went nuts and ripped itself out of its 3-D shadow.
Asuka jumped into battle with Gaghiel without equipment suitable for aquatic combat, although Misato took her side anyway (circumstances forced her hand). In the next episode, she tried to get the battle with Israfel over with early by slicing it in half, but it split into twins and trounced both her and Shinji. Finally, several episodes later, she launched herself out to shoot down Arael, only to fall victim to the Trope Namer of Mind Rape instead.
Ash Ketchum from Pokémon is guilty of this. Despite having Pokémon to fight his battles for him, his solution to most problems upon first encountering them is to let out a Battle Cry and launch himself at them headfirst. This is especially true in the movies. For instance, he ran at Mewtwo and tried to punch him (twice) in the first movienote Bear in mind, Mewtwo is even more broken in this movie than he is in the first-generation games, which is saying a lot. Psychically creating a global-scale hurricane requires about as much mental effort from him as blinking. Even if Mewtwo didn't have a psychic shield around himself (which he did), he's still a 6'7", 269 pound Physical God. He may be a Psychic-type, but he's physically strong on top of that. Ash, on the other hand, is a totally average 10 year old human boy., threw himself at the cage holding Moltres captive at the second, charged at Entei in the third, threw himself at the cage holding Latios in the fifth... and no matter how many times Ash tries to use Take Down, it always has no effect. In genuine Pokemon battles he often orders his Pokemon to take their opponents head-on instead of assessing what they can do (mostly in older seasons, as he's since developed his own brand of strategies that take advantage of the battlefield geography). Basically, Ash can be summed up with "way more guts than brains".
When Orihime goes to Hueco Mundo, Ichigo is told by the Soul Society to stand by and for now consider her to be defecting, but at least they won't specifically mark her death for awhile. Being the Chaotic Good personified he is, Ichigo gleefully ignored that order and bum rushes to Hueco Mundo to save Orihime, accompanied with his friends (later Rukia and Renji follows). This screws up the Soul Society's former plan to get all the Captains together and sent Byakuya, Kenpachi, Unohana, Mayuri and their respective squads to Hueco Mundo, which enables Aizen to lock them there.
Then there's when Ichigo charges blindly at Ulquiorra, who he thought was the top Espada at the time, just because Ulquiorra said he brought Orihime to Hueco Mundo. It ended badly.
In a fight against Ginjo, Uryu tries to tell Ichigo what he figured out about Ginjo's powers, but Ichigo gets bored, comes out of their hiding place and attacks Ginjo head-on. Ichigo is knocked back, and Uryu berates Ichigo for not listening to him. Though this time, Ichigo at least asked beforehand if Uryu had a plan, and only rushed in after he said he didn't. So...progress?
After a heart to heart talk with his father Isshin where he learns about Isshin's past and some important info about hollows and quincies, Ichigo looks to charge into action against the Vandenreich... until Isshin asks him if he even knows where he's supposed to go and how to get there. Ichigo gets embarrassed.
Maki Ichinose serves as a Leeroy Jenkins in the Bount Arc, as he decides to fight Kenpachi and settle his grudge against him for killing the previous captain of Squad 11 rather than preventing Ichigo and the others from pursuing the Bounts into the Seireitei.
In the Hueco Mundo arc, Grimmjow disrupts Aizen's plans by disobeying the order to stay in his chambers and going to save Orihime from two jealous Arrancar, having her heal Ichigo (whom Ulquiorra had left for dead), and sealing Ulquiorra away in another dimension, just so that he can fight Ichigo again. Defied during the infamous "Tea With Aizen" scene. Aizen was instructing the Espada about the invasion by Ichigo and his friends. In the middle, Grimmjow gets up and makes to leave, stating his intention to kill them outright, even though Aizen was not done discussing his plan. He rudely rebuffs an order to sit back down, and is then cowed into obedience by Aizen.
Yammy arrives at Ichigo's fight with Ulquiorra, smashing through the floor like the Kool-Aid man, and kills Loly and Menoly on a whim, thus releasing Orihime. He leaves almost as quickly as he arrives because of Uryu's landmine, then apparently kills Rudobon in the middle of his fight with Rukia. The damage his impulsiveness does to the villains' plans may not be all that significant in light of his being the 0 Espada.
Matsuda, wanting to be of some use to the investigation, goes off to investigate Yotsuba on his own. Unfortunately, at that time, L is in the process of formulating a plan to investigate them that he repeatedly stresses has no room for error or independent action. Matsuda hears a vague reference to killing people, gets caught, and forces L and the others to bail him out. L is annoyed by Matsuda's stupidity, but manages to turn this to his advantage in his longer-term strategy, especially when the time comes to trap Higuchi and Matsuda is chosen to appear on TV to lure him out.
In the climax to the series, Mikami deviates from the plan and takes out his notebook to kill Takada before the task force can find her, resulting in Near finding out where the real notebook is and making a copy of that, too, thus preventing Mikami from killing the SPK and task force in the climax. This was brought on by a spur-of-the-moment strategy that Mello used.
This tactic proves successful earlier in the series when Soichiro Yagami sneaks out of the hospital despite recovering from a (non-Kira-induced) heart attack, drives a police bus through the doors of Sakura TV's headquarters, and manages to stop the broadcast of the Second Kira's messages, despite L and the task force holding back after the second Kira kills Ukita.
In YuYu Hakusho, Yomi was a Leeroy Jenkins back when he worked for Kurama, often going on unauthorized and dangerous raids of his own, until he was eventually blinded in an attack that Kurama set up for him in an attempt to get him out of the way. He learned his lesson after that and developed into a calm, patient Magnificent Bastard.
In Macross, Hayao Kakizaki, brags about how great he is during his first meeting with Hikaru Ichijo. But in combat, he turns out to be a Leeroy Jenkins, who rushes into battle leaving himself wide open. He ends up dying on a mission as a result. While, Maximillian Jenius, who acts scared at first, ends up being a genius pilot.
Shana from Shakugan no Shana has great skill in fighting but poor skill in strategy. As a Flame Haze her plan to rush forward and cut the denizens to pieces. If not for Yuuji's support from the sidelines, she would have likely died a few times over.
Guts from Berserk, especially in his younger days, is very much a Leeroy Jenkins, but manages to succeed in that he's just that friggin' strong. Griffith, rather than try to reign him in, used his unit as a spearhead to disrupt, smash through, or otherwise destroy the enemy's front lines, which usually panic at the sight of him swinging his BFS.
In the first season, Fate tries to extract the six unclaimed Jewel Seeds from the ocean using a spell. When there's a considerable reaction and the ocean itself seems to be attacking her, Admiral Lindy plans to stay back until Fate finishes and then go in and capture her, but Nanoha, who places higher priority on befriending Fate, intervenes with Yuuno to help against orders and leaves with half the Jewel Seeds. Lindy reprimands the two, but lets them off without punishment because things turned out well.
During the hotel attack in StrikerS, Shamal orders the forwards to hold the line against the gadget drones until Vita returns. Teana decides to go on the offensive and destroy the drones with a large Cross Fire Shoot, which almost hits Subaru. Vita saves her, but she yells at Teana for her reckless behaviour and at Subaru for trying to cover her up, ordering the Forwards to go back.
Signum, of all people, was guilty of doing this in the early chapters of the FORCE manga. Rushing into an opponent whose abilities are very dangerous against magical warriors (aka. her kind), without waiting for backup, without any upgrades (even worse by the fact that she's in fact weaker than before because of her toughness and recovering powers started to fade away since StrikerS which take place six years before Force) and without considering that the little info and measures she had about said opponent's abilities can be a bit inaccurate. She got horribly trashed for her troubles.
Naoe Kanatsugu from the Sengoku Basara anime. This is a guy who, upon discovering that the opposing side has deployed Honda Tadakatsu (aka the army's frickin' Gundam), decided that the best course of action is to take it/him on single handedly with no more than a standard issue katana — and naturally gets curb stomped. Maybe he thought katanas really cancut through tanks.
Two big ones in Utawarerumono. The first is Oboro, and in being a Leeroy he kicks off the events of the plot. He more or less grows out of this but is still very rash. The other is the emperor, who felt it would be a good idea to completely ignore his brilliant and highly paid general Benawi and start burning down random neutral villages, forcing them to side with Hakuoro. He doesn't get better, because this gets his country taken over and also gets an "assisted seppuku" for himself, courtesy of Benawi.
In the Fullmetal Alchemist anime, Wrath uses his alchemic powers to fuse with Sloth wanting to protect her. The problem? Wrath had also fused Sloth's weakness into himself. This allows Ed to finish off Sloth.
Oh, and when he gets captured by both Fiore and Queen Nehelenia. The latter, especially: she's willing to just go into a blizzard, barefoot in a foot of snow, to save him from her (without transforming, even).
Seeing, or knowing that, Naru is in danger also sends Usagi into Leroy mode.
Jeremiah Gottwald, upon hearing where Zero is during the battle of Narita, charges off to fight him, resulting in him being defeated and almost killed by Kallen's Radiant Wave Surger. In the Nightmare of Nunnally version of the battle, Alice goes after Zero, hoping to defeat him and be rewarded with a military or knight rank so that she can protect Nunnally.
Suzaku Kururugi also qualifies for this trope, in so much as military command structure will allow him to practice it. He always runs head-first at the enemy in order to defeat them. However, he is a Deconstruction of this trope because he knows damn well the likely result of it, and wants it to happen.
In one episode of Tokyo Mew Mew, Masha tries attacking the Monster of the Week in an attempt to prove useful, getting captured as a result and causing the Mew Mews to spend the rest of the episode trying to get him back.
In one episode of Durarara!!, Izaya and Shizuo, the latter known as Ikebukuro's "God of Destruction" are facing off with one another when a gang of thugs that Izaya had ticked off earlier come running into the middle of things. Upon recognizing Shizuo, they all immediately freak out, not knowing what to do. That all ends when one thug, out of pure fear, screams like a maniac and runs up to crack Shizuo over the head with an improvised bat. Cut to Shizuo punching the guy out of his clothes, then proceeding to Curb Stomp everyone else in sight.
Son Goku typically works in this fashion, at least in the original Dragon Ball, where his plan usually consists of going off after an enemy that's hurt his friends on his own without any care in the world to whatever plan they might have set up, or in other words to simply pound people's faces in. This is most notably seen in the Red Ribbon Arc and especially the Piccolo Daimaou Arc, where Goku ignores a direct order from Master Roshi of all people to not rush off after the enemy.
In Z, he (and Piccolo) take this tack with Frieza, ignoring King Kai's warning against going off against Frieza. It's not as if they had the option of not fighting Frieza.
In the Cell Saga, after Cell becomes even more powerful than before, he kills Vegeta's son, Trunks. Gohan is the only person able to stand up to Cell's power... but Vegeta suddenly unleashes a vicious attack on Cell without warning. Cell promptly retaliates, beating Vegeta senseless, and Gohan has to save him from being killed; in the process, Gohan becomes severely wounded.
Black Star in Soul Eater, frequently as his direct approach (he is ostensibly an assassin) worked for minor threats, but not for big ones. He doesn't so much grow out of it as he becomes better able to face the situations he rushes headlong into. The recklessness and obstinate insistence on his own greatness remain.
Kimba the White Lion: Kimba can be a good planner when he tries to be and is usually successful when it comes to fighting, but it's a safe bet that he would rush out and attack/attempt to befriend the Villain of the Week and ignore the advice of his friends; this method cost him a few battles.
Natsu from Fairy Tail almost never pays attention to mission briefings and will rush off to confront the enemy alone. He also seems to have no concept of stealth. This attitude nearly gets him killed in the Edolas arc because he keeps forgetting that his powers don't work. What makes it worse is that the Tartarus Arc proves that he didn't learn his lesson from the Edolas Arc. Silver reminds him of why this is a bad idea.
It's observed in Pumpkin Scissors that no sane infantryman would attack a tank head-on, and much of the plot revolves around a project to create anti-tank infantry by removing soldiers' fear of pain and death. Yet Alice, who has no such conditioning, attacks a tank with a sword because she refuses to surrender to bandits and mercenaries.
Science Ninja Team Gatchaman. Although G-2 is supposed to be the team hothead, it's G-1, the Mighty Leader, who frequently rushes into a situation without thinking (or waiting for backup), particularly if something else is bothering him that day. It's particularly sad because when he really stops and thinks, he's very good with strategy and tactics.
Judai Yuki from Yu-Gi-Oh! GX ends up pulling a couple of reckless moves in season 2 and 3 as his status as Indy Ploy-pulling ace is steadily deconstructed.
In an episode of Yu-Gi-Oh! 5Ds, Jack Atlas was confronted by Ushio (who was Brainwashed and Crazy due to Rudger's spell), and because his arm was broken, needed Carly's help to duel him. Unfortunately, Carly became too excited, and quickly became somewhat of a Leeroy Jenkins, ordering Jack's monster to attack without asking him (which, as it turned out, was a bad idea). Fortunately, she quickly learned from that mistake - for the most part.
Attack on Titan deconstructs this trope whenever it appears, with tragic consequences whenever a soldier charges off half-cocked. In particular, during his first battle Eren Yeager charges after an enemy in a blind rage and this leads to him being seriously injured as well as getting his entire squad Eaten Alive. The second time he charges off without thinking, it gets him soundly beaten and nearly kidnapped. Levi is injured in the process of rescuing him at a time when the military cannot afford the loss of their best soldier on the front lines.
In both A Certain Magical Index and A Certain Scientific Railgun, Gunha Sogiita's philosophy is to charge into situations without hesitation and punch any bad guys in sight, relying on guts to power through. He even brushes off people trying to explain the situation to him.
Puella Magi Madoka Magica: Mami Tomoeof all people proves to be this, as she dies minutes within announcing she would "finish this Witch off quickly", taking up a more reckless, up-close approach to fighting, rather than from a safe distance as before. Also counts as Too Happy to Live, as all of this is on the heels of she and Madoka pledging to become partners in Witch-hunting, and a monologue about how great she feels knowing she won't be alone any more.
The Scholar's Mate is a version of this, which involves bringing out the queen and bishop to try to checkmate the opponent in the first few moves. It's popular with beginners, but any experienced player can easily fend it off and get a much better position.
Another popular tactic amongst inexperienced players is a form of blitzkrieg, attacking any target of opportunity that presents itself. While often unsuccessful at winning the game, the random movements make it difficult (if not impossible) for the opponent to accurately predict what move will be made next, making a counterattack difficult to formulate.
There is a number of creatures with "this creature attacks each turn if able", which essentially makes them Leeroy Jenkins, and a few other cards which let you turn your opponent's creatures into Leeroy Jenkins.
A particularly notable card is "Lust for War", which has your opponent's creature go all Leeroy Jenkins, and whenever it taps (which it usually does when attacking), it does three damage to its controller. Red is generally the color of rage.
A Red Burn deck uses this concept for the player. It essentially is filled up with a lot of direct damage spells, and hopes that you draw enough of them to kill the opponent with sheer momentum. The problem with this deck is no matter what the game will likely end on Turn 6; either they kill the opponent with their spells or die from the inevitable counter attack, since burn decks seldom to have any creatures to actually defend the player.
The Yu-Gi-Oh! card game has a few cards of this type. Berserk Gorilla, for instance, must attack if at all possible, and Battle Mania, a trap that Yusei once used, forces all of your opponent's monsters into attack mode, and forces them to attack during the Battle Phase. Enishi is often mocked for his recklessness. As a result, Enishi is known as "The Daredevil". Since he knew Shi En when they were part of the "Legendary Six Samurai", he ended becoming "Shien"'s Chancellor because Enishi is not intimidated by him.
World of Warcraft Trading Card Game has Leeroy Jenkins as an actual playable card. It used to be the page image.
Leeroy returns as a card in Hearthstone: Heroes of Warcraft. He can attack the turn he is played since he has the Charge ability, but has a Battlecry effect of giving the opponent two 1/1 dragon whelps upon being put down. note Since he has two health, this is essentially a way to deal immediate one-off damage with him, then he gets killed by the Whelps unless you have a way to keep them off him.
Hilariously lampshaded in Runaways. After Chase runs screaming into battle, Victor actually says to Gert, "You and Old Lace go after Leeroy Jenkins."
Ares, Marvel Comics' God of War, once pointed out a list of things like "white flags, taking prisoners, Geneva Convention thing and checking out if you have enough bullets before rushing into the battle" and concludes that those are things his sister Athena cares about. He's the God of War. To be fair, he is the God of War as in "conflict", and Athena is Goddess of War and of Wisdom, i.e. strategy. So it's in character for him; less in character for Athena to care about Geneva Convention and white flags, considering the original (Greek) myths. She probably doesn't; Ares, being Ares, probably just assumes that everything in war that he doesn't like must be her thing. This characterization is true to their mythological depictions...which is why Athena routinely handed Ares his ass when they were fighting on opposite sides.
The Flash: Impulse used to have this as his primary character trait. Justified in that he was raised in a computer simulation, and basically saw the world as a big video game without long term consequences.
In one Superman/Batman issue, the World's Finest are faced against "Doomstroke", a Fusion Dance of Doomsday and Deathstroke The Terminator. While Batman is wracking his brain trying to figure out what they should do, Superman roars, "We don't have time for strategy!" and punches him, knocking out one of his teeth. Fortunately, this causes Doomstroke to retreat.
Subverted in an issue of Trinity. The heroes are sent to the Mirror Universe, and decide to liberate it. While Batman and Wonder Woman are trying to come up with a plan, Superman storms the Crime Syndicate's base. At first, the others think he did an idiotic move, but Supes beats them all and delivers their unconscious bodies. Superman explains that he deduced that the evil counterparts had grown complacent, as they had been ruling their world without any challenge for years. Also, as they killed their enemies right away, they never developed any real combat experience, while Superman did, since he always fights enemies who have an intent to kill him over and over again. It also helped that he, Batman, and Wonder Woman had had a mind-link put on them that allowed Supes to draw upon their skills and abilities.
Subverted in Astérix as the Gauls don't need to plan their attacks — they can just charge right on in and win the fight. Played straight on occasion with over-eager Roman troops who think it'll be a piece of cake to take down a handful of undisciplined Gauls.
Assassin and marksman Deadshot in the DCU sometimes acts like this. Somewhat explained by the fact that he has a death wish (or more accurately is apathetic about death). He can follow a plan, but if he sees his shot open, he'll take it without hesitation. Several Suicide Squad missions have been cut short by Lawton killing their target while the rest of the team was in the planning stage.
Deadshot: Is there a plan here, or do we just shoot things at random?
Groo The Wanderer often does what Groo does best, i.e., charge in mindlessly and lay waste to everything he sees. To be fair, Groo is so good that he usually doesn't really need to plan, and so dumb that he'd probably just mess things up if he tried, so "attack first and think about it never" quite possibly is the optimum strategy for him.
Green Arrow can be portrayed like this in team books, especially when played against a more level-headed character.
Batman: "We need a plan of attack!" The Creeper: "I got a plan... ATTACK!"
Jason Todd (Robin #2) was prone to this. Most notably in the beginning of Death In The Family when Batman is trying to plan an attack on a group of thugs below but Jason charges in before Batman realizes what's going on.
Woodrow "Woody" Van Chelton of Quantum and Woody, whose solution to nearly every problem is to jump in with guns blazing.
"Plan schman. Beat the crap out of 'em while yelling a lot. It's in every movie."
The trigger scent invokes this on her: Under its influence she falls into a berserker rage during which she has no control over her actions, and will blindly pursue anything contaminated with it, even if they're a friend or loved one. Laura has no more time for plans in this state, the only thought she has until the rage passes (usually after the target has been reduced to a pile of meat confetti, or until the trigger scent wears or can be washed off) is "Kill!"
This Chapter from the Disgaea fic Disgaea: Jewel of the Gods shows that busting through fortresses, with no strategy at all, is the one thing Laharl and Adell agree on.
In the Good OmensfanficManchester Lost by JA Moczo, the archangel Michael is one. While the party is trying to sneak quietly into Hell to rescue a captured comrade, he begins by attacking the first (non-threatening) demon he sees. Crowley (the Noble Demon / party leader) deadpans, "There goes my next raise... [and] thanks to John Wayne here we just lost the element of surprise for absolutely no reason, because demons don't permanently die in Hell." Michael also attacks the Cerberus by himself, despite having the other Archangels as backup. And when faced with an entire army of demons, he walks up to them (again alone) to the tune of "You're the Best." And when Lucifer Ascends into a gigantic monstrosity of evil that is making reality disintegrate, what is his response? "Awesome."
In A Cure for LoveLight of all people does this. When the taskforce are faced with a crazy that's waving a gun around and is also holding onto a Death Note, Light forgets their previous strategy session and just lunges for it. Semi-justified in that his memories are wiped at the time and so his reaction is somewhere along the lines of "My precious" — he doesn't understand why, but he really wantsthat notebook.
Hivefled: Lereal Belsai plans to attack the entire Alternian fleet with his two-hundred-and-fifty cultist followers, most of whom are Child Soldiers or suffering from cull-worthy disabilities, relying on protection from Karkat Vantas' powers as the Second Sufferer. Karkat does not have any powers and is not pleased that Lereal doesn't believe him.
Mei, on the other hand, doesn't really think things through at all, and just charges straight at her enemies, on one occasion forcing Chrono to let their enemies escape in order to save her. This is revealed to be the result of descent from aberserker lineage, which leaves her with almost no fear response and a consequent inability to gauge the results of her actions.
In the remake of Yu Gi Oh The Thousand Year Door, the Shadow Queen, by her own admission, made a mistake like this which cost her the original battle a thousand years ago, charging recklessly into what was an obvious trap set up by the Dragon Master. She nearly makes the same mistake again in a crucial part of the duel with Andy, but remembers the previous incident at the last minute, and reconsiders; this small reconsideration lets her win the duel. (And a powerful lesson on why a Leeroy Jenkins is a bad thing.)
Films — Animation
The Monsters vs. Aliens DVD includes a bonus feature of a storyboarded Leeroy Jenkins scene. It mentions Leeroy Jenkins by name. You've gotta love B.O.B.
Dr. Cockroach: B.O.B., you idiot!
Sulley charging for the flag during the library challenge in Monsters University, after he grows impatient with Mike's attempt at stealth.
Films — Live-Action
In The Return of the King, Merry and Pippin are the first to charge at the host of orcs coming out of Mordor. Luckily, the rest of the army quickly overtakes them. Aragorn was first though.
The Town ends with an example of this. The bank robbers have dressed up as paramedics. They take their loot to their getaway vehicle, which is an ambulance. The whole time they're surrounded by heavily armed SWAT teams that haven't recognized them yet. The ruse is working. They're about to get away. And then one of the robbers fires an M-16 through the ambulance window. Cue most of the bank robbers getting killed.
In The Incredible Hulk (2008 film), main villain Emil Blonsky is very much a Leeroy Jenkins; it's heavily implied that, in his eagerness to fight the Hulk, he prematurely springs an attack on Banner before sniper teams and other supporting units can properly get into position, causing Banner to transform into the Hulk before the military can subdue him. Also (he may not have hurt anyone but himself, but still): "That all you've got?" *THUD* Cue him having every bone in his body broken in about half a second.
In Shaun of the Dead, Diane's boyfriend David is killed by zombies from the window. She grabs David's detached leg and uses it as a club as she charges into the zombie horde. (She also opened the front door, allowing the zombie hoard to attack her other friends inside.)
The extras reveal that she survives, but it costs a man's life.
Episode II: Attack of the Clones: Anakin and Padme rush to Geonosis to rescue Obi-Wan, only to be captured themselves.
Obi-Wan detailing a plan of attack against Dooku, which Anakin doesn't wait to hear before charging in.
"I'm taking him now!" [gets immediately zapped out by lightning]
Played straight in The Empire Strikes Back, when Admiral Ozzel's eagerness for battle results in the fleet coming out of lightspeed too close to the Rebel base, thus alerting the Rebels to the Imperial invasion. Needless to say, Darth Vader is not pleased.
Luke rushing off to face Vader at Cloud City without completing his training and over the protests of both Obi-Wan and Yoda.
Subverted in Return of the Jedi. When the Rebel team on Endor sees Paploo run off alone toward the shield generator, they think he's going to blow their element of surprise, but he actually creates a useful distraction by loudly stealing a speeder bike.
In A New Hope, Han charging a group of Stormtroopers on the Death Star. He actually managed to intimidate them into fleeing until they ran into a much larger group of reinforcements (much, much larger in the special edition).
Subverted in Sam Peckinpah's Cross of Iron. The two lead characters are about to mount a suicidal two man charge on the advancing Russian army when Stransky's gun jams and he can't figure out how to get it working again and Steiner collapses into hysterical laughter watching him struggling with the weapon.
The 2009 Star Trek film has a brief "Leeroy" moment, when the Red Shirt pumps himself up for his fateful skydive onto the Romulan planetary drill.
Paper Moon has a hilarious example. During most of the film, a father and his daughter work as conmen. His daughter is quite good, too. After a while, though, they get arrested by police. How do they escape? The Daughter just shouts RUN!!
In S.W.A.T. (2003), the main character and his partner infiltrate a bank where robbers are holding hostages. The partner breaks his "hold" order and attacks, killing the robbers but wounding a hostage, who sues the city as a result. Through this could be a subversion in that the bank robbers were planning to kill the hostage and if the officers had followed the hold order, the hostage would have likely died.
In Troy, Achilles pulls his own Leeroy-esque move as he attempts to take the beach of Troy with roughly fifty soldiers (several of which are immediately sniped by Trojan archers). All is amended when Achilles himself sets foot on the sand and promptly begins to run through the Trojan forces. After his brief exhibition of Nigh-Invulnerability, he proceeds to desecrate the statue of Apollo, and then performs his second Crowning Moment Of Awesome by throwing a javelin about 200 Yards and successfully smiting a Trojan captain, and scaring the bejesus out of Hector.
The Year One DVD includes a bonus feature where the cast plays out the Leeroy Jenkins skit, complete with some of the dialogue from the original machima.
In The Bourne Ultimatum, reporter Simon Ross deviates from instructions from Bourne on eluding the agents out to get him, and rushes out into the open where a sniper offs him with ease.
In The Last Samurai Algren leads a newly-formed regiment in the introductory battle against the Samurai, who fight without firearms. The plan is to hold fire until the Samurai are within range and let loose. One soldier fires off accidentally, which the other soldiers mistake as the cue to fire their weapons, despite the commanders screaming to cease fire. Their volley's spent before they have time to reload and the Samurai overrun them effortlessly. One could argue that leading the inexperienced troops into battle earlier than expected (before Algren could finish training them) was a Leeroyish move by his commanding officer. Funnily enough, Algren served under (and survived!) notable real-life Leeroy Jenkins General George Armstrong Custer, and there are two points during the film he angrily points out he's no fan of the man and his suicidal tactics.
Ghosts of Mars: Williams charges headlong, both-guns-blazing into the crowd of possessed miners, resulting in the movie's first big shootout.
"Come on, you mindless motherfuckers!"
In Rob Roy, a small group of Rob's clansmen are watching a large troop contingent burn a farm belonging to them. They see that the soldiers are too many to fight directly, so they prepare to draw back into the fog and continue to harry them. Then Rob's little brother Alisdair sees that the leader of the soldiers is the man who raped his sister-in-law. So he takes a shot at him from extreme long range and misses, which alerts the soldiers to the presence of the clansmen. Nearly all of the Scots are promptly butchered when the soldiers chase them.
Deconstructed to an extent in The Hurt Locker, where the adrenaline junkie main character insists his EOD team run into a series of darkened alleyways to attempt to find the insurgents behind a car bombing. Both of his teammates call him out on it, but since he outranks them, they have to go anyway. The ensuing firefight nearly gets one of them killed.
In Wild Wild West, West constantly ignores Gordon's planning and runs right into battle. Only after he causes them to run for their lives and runs out of other options does he ask for Gordon to work out a plan. Gordon doesn't take it too well.
West: Gordon, what's your plan for getting this thing off my neck? Gordon: Excuse me? West: Well, that's what you're here for, right? You're the master of this mechanical stuff. Gordon:(chuckling maniacally) Oh ho ho, I see. Now I'm the "master of this mechanical stuff". As opposed to five minutes ago, when I was calmly and coolly trying to find a solution to this very problem. But then something happened. Someone, who will remain nameless — JIM WEST! — decided to jump over the wire, thereby providing us with that exhilarating romp through the cornfield, and that death-defying leap into the abysmal muck! And here we stand, with that demented maniac hurtling towards our President, with our one and only means of transportation, with Rita as his prisoner, armed with God-knows-what machinery of mass destruction, with the simple intention of overthrowing our government and taking over the country! West: Gordon, I think you need to calm down. Gordon: I can't be calm! Oh, no, no, no, no, I'm the "Master of the Mechanical Stuff"! And I have to help you! You, the master of the STUPID STUFF!
In the 2011 movie Thor, Thor decides to gather his five friends and embark on a "diplomatic" mission to the realm of the ice giants. After a deal of tension, Thor turns to leave, but a giant calls him "princess", prompting him to send Mjolnir through his head at Mach 2. His friends have no choice but to join in the ensuing fight, and while Thor smacks the army around without even trying, one of the other Asgardians is almost mortally wounded, and Odin exiles Thor for his lack of foresight.
This kind of goes both ways, as making gender related insults toward a person allowed them to legally challenge you to a battle to the death in Norse society(provided the insults were untrue). Thor obviously went too far but he would have been justified in killing that one frost giant thanks to Values Dissonance.
In The Untouchables Eliot Ness and the rest of the Untouchables plan to catch a member of Capone's gang midway through a deal with the assistance of the Canadian Mounties who are meant to wait for a signal from the feds before charging, mid-deal gun shots are heard as the Mounties charge anyway, subverted though as they are able to achieve what they wanted to do.
Captain America: We need a plan of attack. Iron Man: I have a plan — Attack.
In the 2011 Three Musketeers movie, the title musketeers are trying to devise the best way to get through a booby-trapped hallway. While they are discussing, Milady just runs through it, narrowly avoiding all the traps.
Averted in Blazing Saddles before the confrontation with Mongo: "If you shoot him, you'll only make him mad."
Used during the Battle of Manassas in Gods and Generals. The Confederates under Stonewall Jackson arrive on the scene. A couple of young guys tell their company, "Come on, we can take 'em!" and charge the Union lines. The rest of the company follows, with the commander basically forced to order a charge retroactively. Looking on, Jackson remarks that "it's good to get your dander up", but correctly predicts the company will be slaughtered.
Colonel Thursday in Fort Apache, who's essentially an Expy of George Custer. Against orders he picks a fight with Cochise (who's willing to negotiate), then leads a cavalry charge into a well-laid Apache ambush. Needless to say, things don't go well. Thursday becomes a martyr for the US Army, with even his subordinate Captain York (who despised him while alive) claiming "no man died more gallantly."
Diggs from Cats & Dogs: The Revenge Of Kitty Galore gets kicked out of the K-9 Unit because of not listening to orders, which results in a building blowing up. It gets deconstructed further as he also keeps messing up missions because of this, leading Butch to chew him out for his behavior and kick him off the team. This leads to Diggs maturing and putting aside his ego.
The Dresden Files: Most of the time Harry comes up with rather decent plans, it's just a given fact that everything will go wrong for him in some way, forcing him to do this. That does not mean it is not his first plan for each given situation. Notable moments being riding a revived Sue the Tyrannosaur directly into a group of necromancers trying to become gods, his battle plan to stop the Summer Lady from ruining the balance in Faerie, and challenging a noblewoman of the Red Court of vampires to a duel to the death to get a girl his daughtershe kidnapped in the middle of her speech to the White Council apparently calling for an end to the war between the two groups.To quote from the twelfth book, Changes, "Fuck subtle."
When playing in-universe RPGs, though, Dresden lives this trope. Anything else would be too much like work.
In the Cory Doctorow novel For the Win, one of the only American characters in the book likes to make money by working with a group of Chinese gamers that help rich westerners with tough MMO battles for a living. Their "customer" in this case plays the trope completely straight, charging recklessly into the boss chamber and ruining the team's careful plans.
In The Cry of the Icemark, some militia breaking ranks to pursue the enemy at the wrong moment results in the loss of an entire elite regiment.
In his first appearance in Guards! Guards!, Carrot Ironfoundersson was something of a Leeroy Jenkins — except he still had discipline, and could be forestalled from doing any crazy shit by ordering him to do something else. Further, because he's Carrot, he pulls off what little Leeroy Jenkins-ish stuff his fellow Watchmen don't stop him from doing (arresting a dragon, arresting the head of the thieves' guild, arresting a rowdy bar in Ankh-Morpork, and arresting the Patrician). It should be pointed out that Carrot is technically the king of Anhk-Morpork which means that his success is justified. Remember: in Discworld, Reality is the bitch of the Theory of Narrative Causality.
In Le Morte Darthur, Sir Gawaine starts a battle by beheading a Roman knight who insulted him at a parley; the trope is subverted in that Gawaine survives and the battle is won.
Namechecked in Walter Jon Williams' Implied Spaces: when Grax the Troll's battle cry turns out to be "Grax the Troll!!!!", the protagonist's cat remarks, "Not exactly 'Leeroy Jenkins', but I suppose it will do.".
The Arends in The Belgariad are a whole race to which this trope applies... they have a reputation for charging headlong into battles with little to no planning, though it crosses over somewhat with Honor Before Reason in their case.
Against anyone else, they're likely to win anyway just because any Arendish knight who's still alive is so because he's survived this sort of insane charge before.
Harry Potter, all the time. It's significant character development in Deathly Hallows when he knows exactly where Voldemort is and what he's up to... and he deliberately doesn't move to stop him, despite Voldemort gaining a very powerful magical artifact as a result. It works out for Harry; the wand Voldemort gains doesn't work for him at its full power — because Harry has already become its master.
Sirius Black also shows this tendency in Prisoner of Azkhaban. Upon learning that the traitor who framed him has been living with the family of Harry's friend for the last twelve years in a guise of a rat, he immediately springs from the prison and rushes in to save his godson.
In Redwall, Felldoh comes over as one too. His actions cast all of his friends and the army they were leading, which wasn't prepared, into a deadly battle that wasn't planned. Only a well-timed Deus ex Machina managed to save them out of that schlemasel. Oh, and Felldoh died also. Guess he learned his lesson.
Don't even try to tell Milla of The Seventh Tower to retreat. If she's not getting you captured by the guards, she's getting you smote off a hill by angry sentient clouds.
Larry Niven's sentient-carnivore Kzintialways attack before they're ready. The greater the chance of defeat, the greater the honor of victory! This tendency was bred into them by the Jotoki, and eugenically bred back out when their suicidal warriors died in glorious battle.
There is whole fleets in The Lost Fleet that fights in this way. Deconstructed as it results in heavy losses. Averted in one battle when the plan was seamingly to head-on battle with twist at the end.
Count Thespides from the Conan the Barbarian story "Black Colossus" ignores Conan's sage military tactics and rushes into battle with his men, falling straight into the fiery trap of Natohk in the process, mainly due to his aristocratic pride and his difficulty in taking orders from a foreign barbarian. Conan refuses to go to his aid, and when Yasmela's page asks why, he replies, "Because I am not so great a fool as he."
The eponymous Prince Roger, much to the constant despair of the marine attachment trying to safely get him home from the Death World they're shipwrecked on, partly due to thinking him just a Long-Haired Pretty Boy that needs saving from his own incompetence. They later discover that while Roger does charge off half-cocked at times, he's more than just the foppish dandy they've always pictured him as, as it was Roger's habit to ditch his guards when out on hunts, which left no witnesses for his badassery while hunting big game.
In Septimus Heap, Jenna attacks Jakey Fry without a concern for not being seen by the pirates that are fighting above her.
A lot of the knights in A Song of Ice and Fire seem to believe that simply charging into battle and letting the Seven guide their blades is the only strategy they need. They are almost never right.
Julian orders Libino to take half a legion and go off to negotiate with a German King. On the way, he meets a German force five times his own. He promptly orders an attack, and he and his Romans are massacred.
In War of the Rats, we have a squad of newbie snipers who are assigned to monitor but not fire on German soldiers during the siege of Stalingrad. One of the newbies gets fed up with seeing all these prime targets walking around and screams an order to open fire. The ensuing fusillade gives the German mortarmen a perfect opportunity to shell the crap out of them. Nice Job Breaking It, Hero is in full effect.
In Warrior Cats: Sign Of The Moon, Foxleap decides to save the rogues from an eagle attack, so the Clan and Tribe cats drive the eagle off. But it results in one Tribe cat to get taken away by a hawk. Foxleap feels guilty about this, but as one Tribe cats puts it when scolding him, the damage had been done.
Back in his army days, Mal from had a tendency to be this. Possibly as a result, hardly any of his squad members survived.
Zoë: First rule of battle, little one: Don't ever let them know where you are. (Mal bursts in firing behind her) Mal: WHOO-HOO! I'M RIGHT HERE! I'M RIGHT HERE! YOU WANT SOME O' ME?! YEAH YOU DO! COME ON! COME ON! Zoë: ... Of course, there are other schools of thought. Mal: They don't like it when you shoot at 'em. I worked that out myself..
In the movie, it's the always cool, competent Zoë of all people who does a minor version of this, abandoning the defensive line set up in order to fight the Reavers hand to hand. To be fair, she's obviously being affected by Wash's death. The sheer death wish of this move horrifies even Jayne.
the show features a whole species of Jenkinses in the Narns. The biggest instance is in the pivotal episode Severed Dreams, where Garibaldi declares to his team that they've reached the right spot to hold their ground against the imminent boarders. The Narns keep going; he shouts "Nuts!" and orders everyone to follow them. Described in the script as "But the Narns, being Narns, keep going."
The Minbari are also a milder version of this. They are said to be psychologically unable to back down or retreat from a fight that is picked with them, but they make up for it by being extremely advanced with powerful warships and shock troops, and able to design amazing battle strategies while they fight.
In an episode of My Name Is Earl, Randy decides to stand up for his little brother against an angry mob.
Randy: Besides, you know I've always wanted to fight thirty people at once. LLLEEEERROOOYYY JEEENNNKIIIINSS!! (Dives headlong into attacking mob)
In Scrubs, Laverne helps Carla break in Turk's car by shouting, "LAVERNNNNE ROBERRRRRRTS!!" and punching the window. To her dismay, Carla had the keys to Turk's car in the first place.
Interestingly, this trope appeared in its modern form years before popularization via the internet. An episode of Matlock features Matlock's sidekick conducting a screaming charge (ultimately into a couch) with "TYYYYLER HUUUUUUUDSOOOOON!"
NCIS has an instance of the name in question — it shows up on a list in Season Four, Episode 87 "Skeletons", right above the highlighted name the viewer is supposed to notice.
Similarly, Psych has a villain named after the original Leeroy, whose name Shawn announces with the appropriate gusto.
Chase often got into trouble in the third season because of his tendency to act on his own, especially when pursuing Jack to Mexico.
Many plans that are laid out in detail that involve civilians or former terrorists fall apart when someone deviates from the plan and acts independently, like in the first season, when one of Senator Palmer's aides stabs the person she is supposed to be recording instead of excusing herself after learning of his planned rendezvous with a fellow conspiracy member. To be fair, this was that woman's Crowning Moment Of Awesome. (It's that kind of show.)
This later causes another Leeroy moment when Jack Bauer poses as the murdered guy to meet the conspiracy member. As he waits in a cafe, one of the snipers who has a personal issue with Bauer begins to taunt him before being told to shut-up by CTU head George Mason. When the conspiracy member realizes Jack is not the guy he was supposed to meet, the sniper ignores all instructions to hold fire (they needed the guy alive) and fatally shoots the suspect causing a loud "DAMNIT!" from Jack Bauer.
Spike sometimes does this. He's perfectly capable of coming up with a good plan, but he rarely has the patience to pull it off. This tendency was made clear in his first appearance, when he was supposed to lead the vampires to kill Buffy on the Night of St. Vigeous, a day of vampiric significance when their power would be heightened — but attacked the day before instead, getting a lot of them killed because he was too impatient to wait.
Spike: I had a plan! A good plan! Smart! Carefully laid out! But I got bored!
On occasion, Buffy show shades of this. But really, it's to be expected, considering that her job basically consists of two things; figuring out how to kill something, and doing so.
Faith too, which leads her into trouble in "Bad Girls."
Heroes season four has Peter rushing off to stop a madman with a gun when he has Rene's ability, in spite Claire's insistence that he should've sent her since she's the one that can't be hurt by bullets. Partially justified in that he's trying not to think about the fact that Nathan is dead.
There is the episode in LOST where the survivors corner Ethan, but just as they are going to imprison him and presumably ask him some vital questions about the island, Charlie shoots him. There is at least one review out there calling Charlie a Leeroy Jenkins.
Stargate Atlantis. Ronon has shades of this, preferring action to planning. However, Sheppard is usually able to restrain him and he generally goes along with the plans. Though with growing reluctance if the plan involves not killing Wraiths.
Pretty bizarre considering the source, but Zeke and Luther has one of these coming from Nana Waffles. Even weirder considering the context, which... involves her playing an MMO with a few other people who are carefully planning out their strategy.
In the season finale of Community, For a Few Paintballs More: "VICKI!!!"
Mulder of The X-Files is infamous for rushing into dangerous situations without thinking things through, usually with less than great results.
Clark Kent from Smallville has an annoying habit of charging into a situation without checking the area for kryptonite or other anti-Kryptonian hazards.
In the episode "Prophecy", Clark's powers get transferred to Lois Lane. She overconfidently charges into action and Toyman quite easily defeats her with a mind-control device.
Level Up: The Leeroy Jenkins meme is referred to by name (as well as the follow-up line, "he just ran in"). It's a shoutout because "Conquerer of All Worlds" is an expy of "World of Warcraft."
Dog With A Blog: Avery does this when she and Stan attempt to get revenge on Stan's former in-game friend, Killgore. Avery, being pretty new to game, has zero patience for Stan's plan and attacks before Stan is ready They still defeat Killgore, who is still pretty savvy, but not match for the surprise attack.
Talyn in Farscape demonstrates that, bad as many Leeroys can be, it's even worse when it's a Living Ship that has this problem.
In Hercules: The Legendary Journeys, when Autolycus the King of Thieves was younger, he was very reckless and arrogant, charging straight into vaults and tombs without paying any heed to traps and guards. When Autolycus meets his younger self with time travel, he is disgusted by him and wonders how he managed to survive long enough to learn caution and planning.
In one episode of The Big Bang Theory, during a game of Dungeons and Dragons, Rajesh expresses disdain for caution and charges headlong into a trap in the first few minutes. His character is killed and he spends the rest of the episode hanging out with the girls.
In the webseries, a scene shown from her point of view has her put a mental target on the first enemy she sees Arthéon, then directy attacking it. Arthéon is in the middle of explaining the strategy while this is happening, but his speech is percieved as unintelligible.
All three media have shown her run to attack an enemy much stonger than her, just because it's an enemy an it's within her eyesight. Gaea puts it best in the comic by saying that she's basically unable to see an enemy without attacking it immediately.
Raphael usually gets saddled with this role in various incarnations of Teenage Mutant Ninja Turtles, including the comics and the original 1990s movies. If the Turtles were a Four-Temperament Ensemble, Raph would definitely be the choleric one. His Hair-Trigger Temper, borderline Psychopathic Manchild impulses, and overall Badass attitude make him the one most likely to either kick a serious amount of ass (good) or do something stupid and/or potentially fatal (bad). In the original 1990 film, he played this to the hilt and got himself temporarily knocked into a coma after falling through a skylight during a battle, although it was more a case of him being Achilles in His Tent.
Raphael: ''[sarcastic]] Oh, so that's the plan of our great leader - just sit here on our butts!
Leonardo: I never said I was your great leader.
Raphael: Well, you act like it sometimes.
Leonardo: Yeah? Well, you act like a jerk sometimes! And this attitude of yours isn't helping anything!
Bobby Lashley has had at least three teammates that fit this mold. The first two being Mike Mondo and Ms. Blue while he was a part of Bolin services, where he would end up getting in fights and matches he really wanted no part of in order to save them. Then when he was working with MVP in TNA, Kenny King was always provoking fights that they sometimes had to save him from and once nearly cost Lashley the World Heavyweight Championship to Tommy Dreamer. King possibly saved Lashley from Samoa Joe the Impact prior though, so he was not completely useless.
In 1st Edition, the Cavalier class in the Unearthed Arcana supplement was required to charge recklessly into battle, even if doing so interfered with or harmed his allies.
The 3.5 character class Knight is encouraged to act this way. Knights cannot make surprise attacks and gain bonuses for shouting challenges at foes, so the most effective tactic is to charge into a room and bellow out a challenge.
In 4th Edition, there's actually an item that acts as a Leeroy: the Invulnerable Coat of Arnd, which goads its wearer into pulling increasingly bold and stupid stunts in the middle of battle and rewards him or her for doing so. The Coat goes back as far as First Edition, although artifacts in 1E didn't get fully detailed descriptions.
4e also brings us the "Essentials": retools of various classes that take out various complexities and typically boil down to "Pick a stance/state, start making melee basic attacks". This was done in the interest of making "simple" characters for either new/casual players to pick up, or longtime vets who didn't feel like picking from a large array of powers every turn. What they didn't count on was the fact that the "Scout" Rangers, "Slayer" Fighters, "Hexblade" Warlocks and "Berserker" Barbarians all had either stances or abilities which greatly enhanced charge attacks; couple that with a gross number of magical weapons and armor pieces that give bonuses to charge or basic melee attacks, and suddenly a Leeroy Jenkins maneuver is the best strategy available.
In the Planescape campaign, one of the major Factions, the Transcendent Order (or the Ciphers) has a requirement for being a member: you must always act on your first impulse. For a Player Character who joins, this gives the Player a rather unique penalty: once he has decided on an action, he is not allowed to change his mind. (In other words, this is where a "no takebacks" rule is mandatory for a player). This does not mean the Player will always become a Leeroy Jenkins, but it might increase the risk or it happening.
As opposed to the well-disciplined war mongers that make up the infernal armies of Hell, their chaotic counterparts the demons are like this, having no other plans but "scream and charge".
GURPS has the disadvantage "On the Edge". You have to make a control roll to avoid doing something stupid. Also Impulsiveness, Overconfidence, Berserk and Bloodlust.
One survival suggestion in Paranoia is to trick everyone else into playing the Leeroy.
Warhammer has three variations on this. The first, Frenzy, results in berserk units rushing after those expendable goblins, getting hammered in the face by Night Goblin Fanatics (who are spinning like tops and wielding massive iron flails) and then being surrounded (or, possibly, ending up in quicksand, falling over a cliff, or other unpleasant fate). The second comes when an enemy unit runs away and the troops who defeated them rush forward to catch them, disrupting a perfect defensive battleline and opening a hole for the enemy to exploit once they've finished ganging up on the Leeroy unit. The third is an inbuilt feature of some units such as Bretonnian Knights Errants to disregard any orders and impetuously charge the nearest enemy unit they can reach.
If it's possible for an entire race to be made up of Leeroys, da Orks qualify: "You lot! Listen up, cos we got a proper scrap to look forward to now! This 'ere door's about to open, and when it does you will see wot we came here ta kill! Wot I want to see is a good 'ard charge! No fancy stuff! On yer feet! Check yer guns! Ready yer choppas! Last one out's a stinkin' panzy! WAAAGH!" The orks being the Orks, this often works. Also, this also means that when the Orks do use a plan, it always works, because no-one expects Orks to ever have a plan. Former Tau Empire Shas'o Commander Farsight being the most notable example (though he did survive to become former Shas'O through abandoning the Tau Empire, which is otherwise unheard of among Tau).
Also from Warhammer 40000 we have the World Eaters Chaos Space Marines. Their "strategy" is to charge into battle blindly screaming "Blood for the Blood God! Skulls for the Skull Throne!" and waving chainaxes. This is due to the fact that their god, Khorne doesn't care whether blood flows from his enemies or his followers, just so long as it flows freely and profusely. The Khornate Berzerkers, being all superhuman gods of war, that 9/10 of these charges are usually complete successes goes to show what kind of place Warhammer 40,000 is, really.
Most Khorne devoties act like that. Several novels depicting the Imperial Guard stated that "those are easier kind to deal with."
The Universal Special Rule Rage embodies this trope in rules form. Basically if there are any enemy units in sight, the only decision you can make for the unit is whether they run or shoot during the shooting phase, in all other phases they will attempt to run as fast as possible to the nearest enemy unit visible to get into hand to hand. Khorne Berserkers use to have a primitive version of this rule in the previous edition, and currently the Death Company of Blood Angels is the most notable users/victims (although in their case it is intended as a last suicidal action).
Speaking of the Blood Angels, this trope is the reason they tend to plan their tactics around aggressive offensive actions centered around their assault squads carving a breach into the enemy line for the rest of their force to wedge into. Because any one of them can potentially be overcome with Unstoppable Rage when the Genetic Memory of his primarch's death flashes into his mind, a focus on direct attack means that their plans do not get compromised if one marine goes charging ahead to get to grips with the foe.
The Space Wolves chapter recruits are prone to this in their earlier years. While in other chapters the position of Scouts and devastators are entrusted to new recruits, in the Space Wolves chapter these responsibilities are handled by old, wizen lone wolves and Longfangs (Space Wolves that have grown so old that their teeth grow into long fangs) respectively. Instead, the new recruit is given a suit of power armor, a pistol and a close combat weapon and are used as shock troops. This is because the Space Wolves themselves are Boisterous Bruisers and almost all new recruits are leeroys, so they have poor tactical choices and aim, whereas Longfangs are much more composed during a firefight and lone wolves know when to not jump out of the bushes.
Lone Wolves, ironically enough, also have Leeroy Jenkins tendencies due to the fact that they're the last members of their "packs" and want nothing more than to restore their honor by dying gloriously in battle. In fact, to reflect this, they have the Special Rule "A Glorious Death" that actually denies the opposing player a kill point if the Lone Wolf dies in battle, instead granting the point if he survives to the end of the game.
Blood Claws that never get over their Leeroy Jenkins mentality are actually given warbikes and jump packs to make them more effective with it.
In Ciaphas Cain: Duty Calls, Cain remarks in the narration that the closest thing to actual tactics that you can get Battle Sisters to follow is to point at the enemy, yell "Heretic!", and get the heck out of the way. He also believes this of the 597th's Lieutenant Jenit Sulla, who has a tendency towards reckless tactics. Played with here, however: they work nearly every time, and Amberley Vail notes that while Sulla's units tend to take slightly higher casualties than average, they also have vastly higher morale.
The Black Crusade supplement The Tome of Excess features explicit rules on how to obtain Khorne's favour by doing this very thing. Given the exact description in the supplement, and that the supplement was written several years after the Trope Namer, it seems likely to be directly inspired.
Werewolf: The Apocalypse has several "battle howls" a character could use. One of them, a signal that one was going to try something particularly daring, desperate, or deranged, was interpreted by younger werewolves as, roughly, "Hey, watch this!" and by older werewolves as "Back off, I'm gonna try something stupid!" On the bright side, if they pulled it off, they would often get a lot of Glory points.
The 6th edition Wargames Research Group army lists describe the Feudal Japanese: It is difficult to imagine how else this army could be used except an immediate impetuous charge, but usually that is enough
BattleTech. The most reckless faction in the setting is Clan Ice Hellion, their primary tactics is strike fast and hard with medium and light mechs. They decided invade the Inner Sphere to reach Terra, by fighting their way in the well garrisoned Clan Jade Falcons occupation zone. The Falcons along with the Hell's Horses retaliated against the invading clan, and only a handful of Clan Ice Hellion survived.
Makuta Icarax doesn't like the complex plan that Teridax has thought up to conquer the universe and thinks that everything would be easier if the Brotherhood of Makuta simply demolished everything in its path.
While Icarax's attitude has gotten him seriously hurt a few times, he at least hasn't endangered his fellow Makuta or their plans yet. Toa Vakama, however, is another story: in his determination to make a rescue, he refused to acknowledge that something was very wrong and wouldn't make time for little things like "caution". He ended up marching his team straight into the enemy base, where they got captured, mutated into half-beast freaks, and nearly killed. His team wasn't happy, and they didn't let it go until they realized their griping was helping to lead him to a Face-Heel Turn.
Icarax ultimately inverts the trope when he tries to throw a wrench into Teridax's plan. Teridax's supporters kill him for his effort — but when the plan succeeds, said supporters have suddenly Outlived Their Usefulness...
Leeroy might've popularized the term, but in actuality, he was preceded by none other than Grom Hellscream in Warcraft III. In the Orc campaign, Thrall was on his way to Stonetalon Peak, trying to avoid contact with humans. Grom suddenly declared that he could wait no longer and that the humans needed to be killed, and so charges off with his own army to the human encampment, at which point you're basically forced to fight the humans as well. Particularly annoying is that if Hellscream used more than five of his 30-odd troops, he could obliterate them all by himself. The dialogue, in a nutshell:
Thrall: All right, we're moving through the Stonetalon Peak. Don't attract any of the humans. Then... Grom: Ah, screw it. Let's go purge these humans! GRROOOOOMMMMM!!! HEEEELLLSCREEEAAAAMMM!!! Thrall: Oh my God, he just ran in... SAVE HIM!
Deconstructed when Ji Firepaw gets the idea to use dynamite to blow up the boat lodged into Shen-zin Su's side. It turns out to be a bad idea, for the giant turtle gets even more wounded, and Aysa Cloudsinger turns against Ji as a result.
An interesting variation of this occurs in Metal Gear Solid 2: Sons of Liberty; near the endgame, Snake escorts Raiden, the player-character, through a particularly tenacious bunch of enemies. You're supposed to run ahead while he provides cover fire, but once you get to the end of the corridor, he runs out and stands still, in the open, to "cover" you. The enemies are smart enough to attack him, and if he dies, you do.
Justice League Heroes has an entire level in which Superman becomes the Leeroy. He's so anxious to get revenge on Darkseid (after an earlier bit of Cutscene Incompetence on the part of the Justice League) that he goes charging headlong into a fortress and not bothering to defend himself. This becomes an Escort Mission in which the player has to try to protect Superman until the end of the level. Since this is Superman we're talking about, sometimes it's less of an "escort mission" and more of a "just stay out of the way while Kal-El does his Unstoppable Rage" mission.
Fallout 3 has Initiate Reddin who Sarah Lyons refers to as a trigger happy liability. Moments later said character is seen rushing towards a noise that is heard and is instantly killed as a super mutant behemoth smashes into the scene and attacks everyone present.
In Broken Steel, they altered a scene where the player takes on the Talon Company (a group of For the Evulz Mercenaries) at their main base. If the player decides to wait until after activating Project Purity to strike, you'll find out that Talon Company was attacking the caravans that the Brotherhood was using to hand out purified water. There's a tied-up Brotherhood Paladin inside the Talon base, if you free him you'll find out he rushed ahead of the rest of his unit and got captured. Said Paladin then charges back against the entire enemy army, and other BoS members show up, but due to their lack of numbers, would get slaughtered trying to help the Paladin, if you don't lend a hand.
In the first game, your companions tend to be this. When the most obvious strategy is to stay back and wait for your enemies to come into range so you can take them out before they get close too close, your allies are sure to run forward and get permanently killed, forcing you to either reload a save, or find someone else to carry all your stuff.
Same for the companions in Fallout: New Vegas, especially if playing with the hardcore option, which makes their deaths permanent like in previous games. E.G., ED-E bumrushes the enemy while playing the "Ralphie the Robot" theme. If Legionary Assassins are present in an area, NPC's will suicide charge them, resulting in failure of their quests.
In the Camp Guardian caves, if you tell Pvt. Halford that "the way up is clear", instead of heading for the nearest exit, he charges into the Lakelurk's nest, likely joining his squadmates in death.
A soldier with the name "Richard L. Jenkins" appears in the first stage. He's the archetypal "chomping at the bit" newbie soldier, itching for battle and glory. Less than a minute into the first mission, before firing his gun even once, he is gunned down in a cutscene with no chance for the player to save him. However, this is actually something of a subversion. Although he does go in ahead of everyone else, this is because Commander Shepard ordered him to take point. Seeing as how he was in a three-man squad composed of a Space Marine (Jenkins), a commissioned technical expert (Kaidan), and the officer in command (Shepard), it can't even be argued that it was illogical to put him on point.
Another reason was because all knowledge of geth weaponry was heavily out of date, since the geth had not been seen outside of the Perseus Veil in over 300 years. Because of this, their shots tore right through Jenkins' shields, meaning he never had a chance anyway.
In Mass Effect 2, you run into a young man named Jonn Whitson, eagerly signing up to take down Archangel. Not only is his fate similar to Jenkins (if you don't intervene, which requires grabbing his shiny new ten-credit pistol and breaking it), but he also looks like him and has the exact same voice.
Also in Mass Effect 2, Prazza on Freedom's Progress. When Tali tells him that he's working with Shepard, like it or not, he ignores her and instead goes forward with a small squad to find Veetor. He and most of his squad are then eviscerated by the giant mech Veetor reprogrammed to attack on sight.
Mass Effect 2 has this as a gameplay mechanic. Vanguards are given a move called the Biotic Charge, where they can phase through obstacles and slam into enemies before shooting them. If they have shields, then they only stumble back rather than go flying.
The third game does the same with the inclusion of Nova; the character drops their shields to do a powerful ground slam. In multiplayer, this can be a problem: target the wrong enemy or one that biotic charge/nove won't work on or don't finish the job and you're hosed. Your teammates might rightly be reluctant to help you here. However, a skilled Vanguard is a Lightning Bruiser easily capable of dishing out more damage than the rest of his/her team combined.
While that last bit is debatable, there is no debating their Lightning Bruiser qualities, just as there is no debating their infuriating knack of screwing up head-shots for Infiltrators on the team by staggering everything in sight.
Grunt also goes on a Leeroy Jenkins charge if he survived the second game, holding off an army of Ravagers by himself and ultimately falling off a cliff, followed by even more Ravagers.And if you completed his loyalty mission, he shows up alive, only complaining about being hungry.
Krogan are built to do this in multiplayer, especially the Krogan Vanguard released in the Resurgence Pack. Instead of Fitness, the melee/shield boosting passive skill everyone else has, Krogan have Rage, which gives them increased damage reduction and melee damage if they kill three opponents with melee in under 30 seconds. Add the Vanguard's biotic charge, and a Krogan vanguard can be one of the most successful Leeroys ever.
Wrex pulls this in the Citadel DLC, cementing this as the proudest of krogan traditions. Given that Wrex is tough enough to give old boots and armour plating a run for their money, he can make it work.
The CE Campaign has one Private Wallace A. Jenkins supposedly die horribly. Ironically, he falls running away from the evil alien zombies. This was years before the trope was named. However, information from the expanded universe proves this trope is actually averted with him as Jenkins was actually present for the opening shots of the Human/Covenant war, and survived through 27 years of fighting. In fact, he doesn't even die from the zombies...he's unlucky enough to be infected by one that's weak enough that it can't take over him completely, trapping him in a half-dead state.
A page from the 2006 Halo Graphic Novel has an L. Jenkins charging into the enemy while screaming, as a plasma grenade barely misses his helmet, and his squadmates are all staring at him.
Brutes in the Halo series are prone to this behaviour which contrasts with their ability to also fight smartly. When they berserk though, they can be the most dangerous, especially when fighting non berserking Brutes at the same time (the reckless berserker can flush you out to get you killed by the others).
Jun from Halo: Reach qualifies. Especially in the third level. See that Jackal with its back on you? Those sleeping Grunts will never know what hit them- aaaand you see Jun yelling and firing at them.
City of Villains has a Shout-Out in the form of Jenkins, a recurring NPC ally who would have been surprisingly competent if he weren't saddled with the standard stupid critter A.I. He shows up in a City of Heroes mission as an enemy, quoting the video: "All right, chumps, let's do this!"
Of the "bad Escort Mission" variety we have Lady Jane, who not so much lacks survival instinct as has a deathwish. And until recently, you had to keep her alive. Much anger was had. To push the reference further, her initials are L.J.
There is also the recurring NPC hero in City of Heroes named Fusionette, who not only aggros mobs like mad, she's a Blaster.
Escorting people who could take damage was always risky in large teams, as the enemy damage scales while the escort's health doesn't.
One of the most common complaints among Mastermind players is this, especially in ranged pets. Sometimes, one robot charging in to brawl is enough to get the whole team destroyed.
Duke Nukem Forever likewise has Private Leeroy Jenkins, who is "the only other poor motherbleeper who is as crazy to go with you." Guess just what happens right after his CO expressively asks you not to get him killed.
The game has one also, a dwarf named Kilroy Stonekin. Missions with him typically involve trying to keep up with him and keep him alive while he charges from one mob of bad guys to the next.
Prince Rurik. "You are a pox on Ascalon, and I am the cure!"
It's hereditary. In the Prophecies endgame, there is a certainquest that involves helping King Adelbern fight off titans invading Ascalon. ...With only three soldiers. Cue the king not bothering to wait five seconds for the player's party to meet up with them and charging headlong at a wave of Eldritch Abominations.
Another dwarf very late into the Prophecies Campaign also Leeroys a bunch of Mursaat as a Heroic Sacrifice.
Heroes and henchmen can easily Leeroy. If you set them to "Aggressive" then they will attack a mob that is too close and they will actually aggro the swarm of enemies. Especially annoying to Henchmen-hero players who try to avoid fighting everything.
Oblivion's NPCs invariably exhibit this trope, whether or not an amusing death has been scripted for them. As soon as the combat music starts playing, they'll yell "STICK TOGETHEEEEER!", and disregard their own advice by charging into the fray.
There is also a similar NPC in The Elder Scrolls IV: Oblivion who blindly rushes into a dungeon trap after requesting your help to save his fallen comrades. With a spot of luck he can be saved, although the programmers never intended this to happen and he will just stand around doing nothing.
Special mention must go to Berich Inian, who fights alongside you in The Battle for Castle Kvatch - or, rather, who runs off immediately in to the largest group of Daedra he can find the moment you're out in the open.
And an extra special mention (quite possibly the trophy of this trope) to Farwil Indarys, the foolhardy son of the Count of Cheydinhal, who rushed blindly into an Oblivion Gate with a group of Knights and got all but one of his comrades killed. The player then has to babysit the two of them until the Gate has been shut. Farwill will bumrush every single enemy in sight, and will even follow them off cliffs and into the lava below. The only certain way to make sure he gets home in one piece is to use a cheat code to turn off the combat AI and just let him follow you to the Sigil Stone.
The Elder Scrolls V: Skyrim carries on the tradition, made even worse by the fact that towns can be attacked at any time by dragons (and, if Dawnguard is installed, vampires). When this happens, every adult NPC in the area, from town guardsmen to unarmed civilians, will charge into battle, often with nothing but a dagger and a cry of "Skyrim belongs to the Nords!" Especially annoying in Riften, where it is easy for irreplaceable shopkeepers to get killed off permanently.
This is sometimes a unit flaw in strategy games:
In Heroes of Might and Magic IV, the barbarian units (the berserkers, specifically) can't be controlled and will automatically use all their turns to charge at the enemy. This prevents the Might faction from using the "camping" tactic of staying back and letting fast enemy units get themselves slaughtered while wearing down more powerful and slow enemy troops with ranged attacks and spells.
The Tribes of the East stand-alone expansion for Heroes of Might and Magic V encourages this with the 'blood-rage' mechanic; barbarian troops are penalized if they take a wait or defend action, encouraging the player to use them aggressively.
"May charge without orders" is a unit trait in Medieval II: Total War. In addition to undisciplined and overzealous units (like certain crusade/jihad mercenaries and Highland Pikemen), the easily, commonly and quickly available Feudal Knights have it.
The three paladins that protect Princess Lachesis in Fire Emblem 4 stupidly attack the enemy and get themselves killed or injured, derailing your strategies. The worst is that you need all of them alive to gain an unique item, prompting many player to leave Lachesis in the home castle and not use her for a full chapter, despite the fact that she is an example of magikarp power.
It doesn't get any better in FE 7. The only neutral units (i.e. on your side but not controllable) with any sense of self-preservation are the ones you can recruit. Apparently green is the new red in the FE 'verse.
At least in FE 7 you can pick up these neutral peeps and keep them safe. Yeah, your stats will be lowered until you let them go, but that's better than just risking to lose them. FE 4 didn't have that command, so...
In The Sacred Stones, Ephraim leads an attack on a large, heavily fortified enemy castle with all of three men backing him up.
Lulu fits this exactly, charging with a dagger at Chris Lightfellow, a fully armored, mounted knight.
To a much lesser extent, Hugo initially falls into this category and has to be stopped by Sgt. Joe. Not quite the same level as Lulu, but when compared to Chris or Geddoe or even Thomas, he is extremely reckless.
In the first level of Rainbow Six: Vegas 2 your squad is given orders not to fire on terrorists till another set of people arrive. Your overzealous teammate decides to say "Screw it" and get the negotiator killed.
Despite the Pyro's intention as a class for ambushes, flanking and hit-and-run skirmishes, many players of Pyro (when they aren't spy-checking) seem to think that the class is for Leeroy Jenkins-style assaults on the enemy defences. Which, unless you're being Ubercharged, it isn't.
This type of Pyro is called the "W+M1 Pyro", W being the key to run forward and M1 being the key to fire respectively. The term is rather derisive, and is usually used to suggest that the person playing the Pyro that way is a Noob with that class for not yet picking up that there are more effective ways to play them.
Spies occasionally fall under this, when they will run straight up to an enemy sentry gun and sap it even when the Engineer or other enemies are standing right there. Other times a Spy will back stab the first enemy they come across even if it will drop their disguise in the middle of the enemy team and there are better targets available.
Other classes also tend to get more reckless than usual when being healed by a Medic (getting an HP cap boost AND a continual stream of healing does make you tougher to kill, but not invincible until the ubercharge pops).
The guy who runs ahead of the team and triggers the climax event before your team has even reloaded, let alone decided on a defensive position. Or runs ahead to get pounced on by a Hunter or snatched by a Smoker. At which point they scream at you to go help them or they'll blame you for not rushing in to save them. Very rarely does running ahead ever succeed. (As this video shows, the few times they do succeed is more a result of luck or surviving team members rallying together to snatch victory from the jaws of stupidity.)
Or the one who stays behind to take on a Tank when everyone else is fleeing, trying to save on health and ammo. Then again, most of these actions can be from a griefer.
And then there is the guy who tries to take on every Witch the party encounters. A Leeroy Jenkins will usually get owned by the Witch 9 times out of 10. A decent player will just screw up sometimes, or just leave the damned mutant alone. Leeroys will also attempt to use any weapon besides shotguns to kill the Witch (only headshots from a shotgun can instantly kill her).
Gets worse on Expert difficulty and Realism mode where the Witch can instantly kill you if she swipes at you. Leeroys will try to take her on anyway, die, then rage quit.
You'll also have the guy who thinks running ahead to the end of the map will somehow help him avoid all the infected when it is more likely that the AI director will either punish the normal players, causing them to scream at the runner, or the runner himself will get punished and then blame his team for not rushing in to save him (most players will let the guy die on his own).
And then there is the guy who thinks shooting all the car alarms is a good idea and think their team can handle the new horde while ignoring the fact that most players are trying to conserve health and ammo. Gets worse in The Parish when you have to go through a lot filled with car alarms and there's bound to be one guy who will try to trigger every single car, though he may be on his first play-through, or (much more likely) a griefer.
There is also that one guy who will split off from the group during Scavenge mode or the finales in Dead Center/The Passing to get gas cans on their own while everyone else sticks together to get the cans. You can bet your pills that the loner will be attacked, killed, then Rage Quit.
Veteran Versus players tend to use a glitch on the 4th misson of Dead Air at the main horde event. You activate the van, run for the fence and tell everybody to wait right in the car's way (the car just pushes the players through the fence giving a good ahead advantage for rushing the rest of the mission and leaving the infected team behind). When you are on the run you realize that Louis just thought it was better to stand behind the counter and now he is being eaten by a horde. Not to mention when you are near the end of that mission and Louis again thinks that it would be fun to pass through the metal detector.
And on the Infected side, you have Hunter-users who insist on pouncing when the survivors other than the victim are nearby and not distracted by a mob of normal zombies. Or the Boomers who absolutely must suicide when they very well can hang back and recharge their puke.
Similarly, there will be Hunter players who insist on getting to the highest rooftop possible for the sake of making a 25 point damage pounce when they could have worked with the rest of the team to set up an ambush. Then there are Boomer and Spitter players who will charge at the survivors in the open and either get killed or hit one survivor and then be killed when they could have sniped at the survivors through a window or on a rooftop. On top of this, Tank players who have a case of the Leeroy will blindly run into the survivors' line of fire while trying to chase and attack them instead of taking cover so the rest of the zombie team can slow the survivors down.
Charger players will do a similar action where instead of separating the survivors as the Chargers was designed for, the player will always attempt to Leeory with the charger by attempting to plow a survivor off a cliff or rooftop (if the map has one) for an instant kill, which they usually fail at 90% of the time and are met with scorn by the other players as they are now down one player.
Depending on the situation, this might also apply in reverse — anyone's whos ever played a round of Left 4 Dead has at least once encountered another trigger-happy killer who will happily fall behind (or worse, charge in reverse) the rest of the group to shoot (although the behaviour is more common with melee users) stray zombies and rack up "kills". While it's fine to help defend the rear of your party, not learning to stick to the party/run and gun will very likely lead to incapacitation, and the annoyance of your team mates as they run back to help you.
Similarly, there are guys who will shoot a car that is near the safe house and will stay outside to kill the incoming horde or during the finale when the rescue has arrived, they will stay behind and keep killing zombies until they run out of ammo or get pounced.
Left 4 Dead 2 introduces the Grenade Launcher and Chainsaw. Both are powerful weapons but can also cause lots of friendly fire damage if not handled properly. A good player will usually have minimal friendly fire with these weapons. A leeroy will most likely take someone's health from the green to the red or incapacitate them with the said weapons.
The Molotov is a valuable bomb item that sets zombies on fire, but in the hands of a leeroy, they will most likely botch their throw often and wind up burning the survivors instead or block their path with the fire, delaying their progress and giving the infected time to attack.
Bile Bombs fall under the same situation; using one attracts a horde to the spot you threw the bomb at and they will also attack any zombies that gets splashed by it. A Leeroy will always throw a bile bomb on a Tank and insist that the horde will do enough damage and slow it down. This is helpful if there are already zombies present. Most of the time, the Tank that's spawned is usually alone and doesn't have common infected near it and it takes time to generate zombies if there's none in the area and a bile bomb is used to call them. By the time the zombies come out, the bile bomb has worn off and now you got an angry Tank and a horde to deal with.
The Taaaaaaaaaaaaaaaaank! mutation actually can encourage this. Since all the Special Infected are Tanks, you don't run the risk of being snagged and choked/crushed/ripped to shreds by a special if you charge ahead. Also, since the Tanks will likely spawn behind the survivors if the survivors can get far enough in the level before the Tanks spawn, most games are just a mad dash to the saferoom.
Put simply, one of the best plans for making it through campaigns on Expert involves the entire team doing this.
Anyone who has completed the campaign in Battlefield: Bad Company will know that Haggard is a Leeroy Jenkins. While his squad was chasing a convoy of trucks filled the Legionares gold, they eventually came to an international border. If it was an enemy border, they would have kept going. It wasn't, though. The country the truck was entering was Neutral. That didn't stop Haggard. He ran in, waving his hands in the air, shotgun in one of them, screaming "THERE'S GOLD IN THEM TRUCKS!" while firing the pump-action into the air. Haggard's actions lead the squad leader to stay in the army for 1 year and 6 months (he was supposed to be leaving the next day), and their squad had to get out of the country themselves.
The multiplayer of these games is largely designed so that a Leeroy Jenkins-esque assault on an enemy group will never succeed. Seeing as professional Leeroys are either very bad at the game or actively trying to screw over their team, they will rarely get more than a handful of kills and stand no chance of getting an objective. Doesn'tstopsomepeople.
Also in the multiplayer, vehicles tend to be powerful enough to turn the tide of battle when used appropriately. When commandeered by a Leeroy, they essentially become very expensive taxis, which are usually abandoned as soon as they take a hit, even when cover is available, an engineer is actively repairing the vehicle, or when the hit is so weak as to cause minimal damage. Best example is the aircraft. Loaded with rockets, bombs or machine guns, you will have either A) someone using it to rack up kills on a Conquest map or B) hop in one of these strategic resources for the sole purpose of jumping out over what they think is a good sniping position. A lot of mods, such as Project Reality, take steps to avoid exactly this sort of behavior by removing universal parachutes, making aircraft useable only to a certain class, etc.
There are too many new players in Jedi Outcast's multiplayer mode whose strategies consist of holding the run forward and attack buttons at the same time until someone dies (invariably them, also invariably at the hands of someone who spams a certain unblockable lunge attack).
MediEvil started out with this, Dan, the hero, charged in way out of formation at the start of the fight against Zarok, only to be promptly killed by an arrow sniping him in the eye.
Tellah, for dashing into battle alone against Golbez. Golbez just stands there and taunts him, presumably amused at the feeble old man casting his feeble old man spells (albeit ones worth several thousand damage apiece). Then Tellah breaks out Meteor. CMOA ensues.
Then there's Edge charging Rubicante. Luckily for him, Rubicante is merciful.
The endgame probably also counts, when Golbez and FuSoYa decide that they can handle Zemus on their own, without the help of the player party. By the way, this is after the parties in question realized that they're all on the same side. To be fair, though, Golbez and FuSoYa make short work of Zemus, and weren't expecting Zeromus to emerge from the corpse.
Ashe from Final Fantasy XII wants to defeat the Empire. What's her plan of action? She has none... she just goes in and fights.
Snow Villers from Final Fantasy XIII and his "Heroes don't need plans" motto is deconstructed as the way he rushes in a battle and makes a false landing is an indirect cause of Nora Estheim's death. He gets better by at one point, as he's talking to Lightning about making a plan before attacking an enemy's base. He still (ineffectively) charges at the Big Bad every time he makes a "The Reason You Suck" Speech.
For most of the games, the Berserk status effect can turn any character into a Leeroy by forcing them to use the Attack command only and uncontrollably. In some games, Berserk also boosts the character's strength, so players can use the effect with strategy. If you use Berserk at the wrong time or the enemy uses it against you, then expect the character to do stupid things like attacking an enemy that is scripted to counterattack.
In BattleTech: The Crescenthawk's Inception, as you hired pilots, you would have to watch each new one to see how good they were (abilities varied from game to game). The worst of the bunch invariably charged with their very expensive and difficult to repair 'Mechs right into enemy squads.
If one were to press the triangle button in battle, while playing Persona 3/FES or Persona 4, one would see a perfect example of a Leeroy Jenkins. Unless you have been Level Grinding nonstop, or are on your New Game+ . Even more so if you waited for The Reaper to appear and initiate a Curb-Stomp Battle.
Story-wise, in Persona 3, Junpei pulls one of these during one mission. Yukari and the main character manage to catch up before anything bad happens, though.
In Junpei's case, it's due to his own frustration at either feeling inferior to male main or having his male ego hurt by having the female main and Yukari prove more reliable than he is that causes him to pull this off in an attempt to show off and prove himself capable. Naturally he fails and they need to work as a team to complete the mission and Junpei realizes how stupid he was being.
Persona 4's Chie pulls this during the Investigation Team's first foray into Yukiko's dungeon, mainly due to her being worried sick about Yukiko. The protagonist and Yosuke have to save her because at this point, she is not a Persona user, which you have to be to fight the Shadows of the TV World. She ends up running into her own Shadow, which they have to defeat in order to save her and supply her with a Persona of her own.
Maniac, whose callsign is well-earned, will frequently Leeroy his way around, rashly jumping straight into the action at all times being a consistent character trait throughout the series. He never listens to you and attacks at the first sign of the Kilrathi. As time goes on he's shown to be one of the most skilled human pilots around...but still never listens to a word you say. The only place he always obeys orders is on the final mission set in Wing Commander III. Anywhere else, anything but "break and attack" often gets ignored.
He's bad enough in the original that, at one point, your CO authorizes you to fire at him if his recklessness ends up jeopardizing the mission.
Blair: Should I use missiles, sir, or ship's guns? Col. Halcyon: Guns, [callsign]. Save your missiles for important targets.
In Wing Commander II, Blair once flies off on his own in order to save Stingray after he ejects, and gets reprimanded for it. In the game's final mission (on both paths), he flies off on his own to destroy the Kilrathi starbase, and when he succeeds, gets a McCloud Speech from Tolwyn.
From Wing Commander III:
Blair can choose to chase after the fleeing Mole after the pilot Cobra is killed, but if he does, Vaquero dies, and Blair is admonished.
Rose of Fable II gets a moment of this. When you're walking through an alleyway, a dog yelping is heard. Cue Rose rushing right up to its tormentor to challenge him... only to get promptly knocked out by a head butt, leaving you, her much smaller but thankfully also much tougher sibling to take the bully down. She gets up and, promptly says "Thanks! I could've taken him though..." in true Leeroy style. It does illustrate the fact that while Rose is trying to be a responsible adult figure, she's still just a kid herself.
Enforced in Samurai Warriors 3, in Yukimura Sanada's final campaign mission. After Hideyori Toyotomi is assasinated by Hanzô Hattori, Yukimura himself declares the battle lost, and the victory conditions are changed to only Yukimura (the player)'s survival. Yukimura must then charge alone to Ieyasu Tokugawa's camp and kill him by himself. This was also done in the first game. Wondering why a game about massive armies clashing against each other even have an actual objective for going Leeroy? It's because Yukimura Sanada actually did this in real life for the same reasons. He almost killed Ieyasu Tokugawa before dying from exhaustion because of this, and it's the biggest thing he's known for today.
If you side with the ill-fated Western Army during the Battle of Sekigahara in Samurai Warriors Chronicles, your side quickly becomes overwhelmed by the enemy. In a bid to help commander Mitsunari Ishida escape, Sakon Shima must charge the enemy's main camp to provide a distraction. To make it worse, Sakon is gravely injured and he must make it there before he succumbs to his wounds. If you choose to not have Sakon as one of the player characters in this mission, then his charge becomes Escorting Leeroy Jenkins (albeit somewhat justified).
Fukushima Masanori has a tendency to make reckless charges, necessitating the player character to rescue him.
Supreme Commander features a variation of this, wherein the character himself is not a Leeroy Jenkins per se (the ACU is the primary builder and thus doesn't leave the base), but his tactics have every hallmark of the trope. In the fifth mission, you are joined by a fellow commander named Fletcher. This blatantly racist jackass should already be grating on your nerves, having been spouting his nonsense in every mission thus far, and his appearance on the battlefield doessn't help. The first thing he does is get enough mass extractors and energy generators running to let him build Fatboys. Then he'll do that. And nothing else. This guy will do absolutely nothing to defend himself (no defense towers, no shield towers, nothing) short of giving his ACU a shield, and your opponent will exploit this. You are expected to keep this bastard alive. To make things even more insulting (but also very satisfying), you have to kill him in the next mission when he finally goes nuts.
If you take too long to defeat the Sector X boss, Slippy will try to attack it only to be swatted aside and sent hurling off to Titania, forcing you to go rescue him in the next mission and ruining your chances of entering Venom the good way.
Falco is a pretty hotshot pilot, earning more kills than any of the rest of your wingmates — if you can keep him from being shot down as he charges ahead.
Syphon Filter has an Agency operative named Jenkins who was killed along with the rest of his squad in Washington Park.
Soul Nomad & the World Eaters. Levin has the tendency to, as Gig put it, "find tornadoes of crap to jump into", and goes charging off without a second thought in many cases, whether it's to find his sister or pursue an enemy. The bad news is that he always attracts trouble doing this, and you have to clean up after him. It turns out he led all of these guys back to you on purpose. When Gig says it's man-cow's fault, it really is. And you will hate him for it.
Maxwell in Scribblenauts becomes a Leeroy Jenkins of sorts (mainly due to finicky controls), where one mis-click while building an elaborate solution to a puzzle can often send Maxwell flying into a room filled with sleeping enemies, a tank of sharks, pit of lava, etc. causing you to fail the mission.
Alien Swarm can be full of these guys. You will have one type of Leeroy who will not stop moving and keep blazing through the level, regardless of his teammates who are getting mauled by the aliens. It also gets worse when you have these type of players do this in order to get the achievements for speed running a level and not tell the rest of the team what they want to do. Then there are the Leeroys who will spam power weapons like the Flamethrower or the grenade attachments from certain guns, regardless of who is in front.
Exit Fate: Any battle scenario where some of your troops are AI-controlled. The Battle at Grunthall is particularily grievous — the small force already in place will just charge the enemy and get slaughtered before you can reach them, even if you move as fast as you can, to say nothing about staying in formation. Even more frustrating, scoring an A on the battle allows you to get a particular war leader early (thus making later battles easier) but scoring an A is almost impossible when the AI screws up.
A rare example of an RTS being vulnerable to this is AI War Fleet Command. With the way the AI team works (openly ignoring resources and increasing in ferocity based on how much you piss it off) a player who mindlessly attacks system after system can end up getting everyone killed.
Edy Nelson's embodiment of this is what kicks off the Edy Detachment DLC, where she chased after Imperial soldiers "screaming like a banshee" and gets herself and a few squadmates stuck behind enemy lines. They stumble upon a village under attack by more Imperial forces, so Edy rallies the group with her to go defend it. Towards the end of the mission, she hears that Rosie's been shot, so she runs across the battlefield to get to her, because she can't die until Edy surpasses her on the stage.
General Damon, the epically incompetent standard bearer for The Neidermeyer, kepr repeatedly trying this idiocy, especially in the anime even when an utter fool would call it suicide. For example, he once attempts to charge an Imperial held supply base in the middle of a forest across a stretch of open ground that is basically an Imperial advantaged free fire zone, which the enemy commander, Berthold Gregor, takes shameless advantage off as Damon's troops are killed en masse by a wall of artillery and infantry teams shooting the crap out of Damon's troops behind very good cover. What makes this even more suicidal is that the Imperials were not that numerous and quite vulnerable to a flank attack through the forest, a very simple strategy that Welkin Gunther and his handful of troops from Squad 7 use to their advantage and wind up pwning the whole base where Damon fails, all because they decided to spot a better opening and wait for the right time to use it.
Julianna Everheart from Valkyria Chronicles II is this, despite all the mentions of her being a tactical genius. Her idea of tactics is to rush your base alone, which might make some sense as she's a Fencer and Fencers have the best frontal assaults, but she's unsupported and can easily be flanked. Her reasoning is that she figured victory for her team was inevitable as long as she herself was perfect.
Even then, she has some questionable tactics in the first place. Her personal Order, Forced Charge, gives her the ability to vault across the battlefield, but requires her to slash at anything in her way... including tanks and APCs, neither of which she can really so much as dent from the front. Forced Charge is always her first move when her phase starts.
Etrian Odyssey III: The Drowned City has Agata, a Highly-Visible Ninja of Guild Mumotsumi. Traveling through the Yggdrasil Labyrinth can be difficult enough with a full party of five; Agata, meanwhile, likes to go charging in and leave the rest of his guild behind, heedless of the FOEs and other dangers. Depending on how you handle him, this has grave consequences for either him or his partner Hypatia.
Dwarven soldiers will do this in Dwarf Fortress — got one lone straggler, or a soldier to arrives to formation ahead of everyone else? He'll charge solo into a 10-goblin raiding party. Also companions in Adventurer mode — you could be walking through the forest and your buddy disappears to go racing after deer, sometimes never to be seen again.
A quest in Dungeons & Dragons Online requires a party to protect an NPC, Coyle, for 15 minutes. Coyle attacks and provokes many enemies and dies all too easily, causing the quest to fail. Game developers eventually added an option to knock him out to protect him, yet players still have to keep Coyle from area-of-effect damage that will wake him up, again.
Sheva of Resident Evil 5 will often run towards large targets and fire her pistol at them, wasting her ammo and constantly costing her her life. This will eat up precious healing items and time, and sometimes she'll be far too distracted halfway across a stage with shooting at an unecessary enemy to come and heal you if you're dying or she may get herself stuck or killed on her way over. This is fully remedied if you're playing with a human character, and this can cause Fake Difficulty in certain areas.
Airforce Delta Strike has John Rundal. In the very first mission, he willfully disregards direct orders from his section leader and breaks off to take on more fighters. Meanwhile, the bombers he was orderede to shoot down were still flying towards their target with full payloads.
The Mission "Engine of Destruction" in Starcraft II has you attempting to protect Humongous Mecha whose driver is doing this (and his failure to realize the mech's communication system was stuck on broadcast means he cannot hear orders to stop.) Subverted by the fact that the mecha is a Super Prototype and, with judicious use of Worker Units to repair it, can basically solo the mission. Except on Hard Mode...
Ally AI in Front Mission Evolved does this (enemy AI at least knows how to take cover every once in a while). Thankfully they're indestructible and can actually kill stuff on their own if you're not worried about a time limit.
In Call of Duty: Black Ops Zombies, this is a major problem, especially with pickup games. Even though this mode of the game is essentially a survival shooter, and doesn't require the most strategy, planning, foresight, and timing are beneficial to the mission, as opening the wrong door at the wrong time, failing to hold a position, or simply not being cognizant of where you are at in relation to your teammates, can make all the difference between a successful level, and a disastrous defeat. In Cod:BOZ, it' s quite common to end up on teams with one or more Leeroy Jenkinses who will, without consulting the team or anything:
Open various doors as soon as they get the money. This increases the number of active zombie spawn points to deal with, making it harder for any one person to kill all zombies in their area. It also effectively shortens the amount of time that a player can spend in an area grinding for points that they could use later on in the stage: instead of having to guard only one window, each individual person now has to guard two or three windows. Average joe A may have been able to guard 1 window for X rounds, but when tasked with two or three windows, after a certain volume of zombies, they have no choice but to leave early, and thus forfeit points that would have come in handy later on.
Run into various windows that people are already occupying. The major problem with this being that often times, 2 people in one window is just another way of saying 0 people in another one. Teams often get overrun by this, and by its variant, wherein said Leeroy runs into another window, you run into his, only to be killed by zombies that ran out of the window that you left to Leeroy: Leeroy more often than not has ADHD, and won't stay in any window for any period of time.
Run into various parts of the map without proper backup or weapons, expecting you to save him. This will kill a team quickly as well: this troper has found that it doesn't really matter how much ammo you waste trying to save Leeroy, they'll just die again in 30 seconds. Unfortunately, due to the poor hosting system that COD:BOZ has, this can lead to Leeroy attempting to hijack the game: threatening to quit and end the game for everyone if they let said Leeroy die.
In Improbable Island, one of the monsters you face is a parody of Leeroy Jenkins called "Bumbling Ally". He attacks you with "dangerous incompetence".
The first outing with a three-man squad can play this straight or avert it. If Charlie, who outranks the player character, is with you, he orders you to take cover and wait for his signal to open fire on unsuspecting enemies. If Charlie isn't there and your best pal Big Bo is, he'll suggest rushing right at them and taking whatever they dish out. You don't have to actually follow either plan, but you'll lose trust with your team if you go off script.
One of the commands Dan can give the squad in combat is "Charge!", which involves getting out of cover and blitzing enemies. If a charge command goes sour and one of your teammates takes a lot of damage, they'll criticize you for giving kamikaze orders that put the whole team in danger.
On the other hand, later in the game Dan (who by this point practically defines Lightning Bruiser) can play the Leeroy to amazing effect. Your teammates have an unfortunate tendency to wander through your line of fire, so charging in and utterly demolishing a squad of robots is not only a good (and utterly awesome) way to avoid friendly fire, it also increases your teammates' loyalty ratings.
PAYDAY: The Heist tends to have a lot of leeroy players that charge against an army of SWAT units, blindly run out in the open where a sniper can take them down, or go on a killing spree on the innocent civilians, which will impose a steep cash penalty at the end of the mission for the offender and reduces the chances of having a hostage to trade off should a player be arrested. This is most likely due to people who are used to playing Halo or Call of Duty where you can take out enemies quickly with minimal damage if you got decent aim. Even people who played Left 4 Dead tend to try and play PAYDAY with the Left 4 Dead mindset, only to quickly get their asses handed to them. Leeroy players that do the above actions and then get arrested tend to rage quit, especially on Hard or higher where you need a hostage to get a player out of custody or that player is out of the game until then.
In the Castlevania: Harmony of Despair multiplayer co-op mode, enemy HP scales with number of players and some bosses (Gergoth, Death, Lord of Flies, R. The Count) trigger hazards that go beyond the boss chamber, so it's generally a good idea to fight as a party, but Soma players who only need Boss souls will often just make a beeline for the boss whether or not they could handle the battle by themselve(s).
In true style, the Dawn of War games feature attack modes called range, mixed, and melee. In melee mode, that unit will charge any nearby enemy as long as it's in sight. You can kite away enemies while firing on the run and flank them. It's really annoying if you stop paying attention because your units can do the same thing and get slaughtered.
In Pokémon there are several moves that attack for multiple turns like Rollout, Outrage, and Thrash that force your pokemon to use them the following turn even if you don't want to and also prevents it from switching out.
Bannon at one point is ordered to keep his troops in a guard position around allied forces. When he sees that nothing is happening in his sector however, he decides to send his forces to join Parker (the player characteR) in battle. Just as he does this however, the Soviets attack the sector Bannon was supposed to be guarding and a fairly high-ranking French commander is killed as a result of him abandoning his post.
In multiplayer, this can apply to players who charge off without anti-air cover and get demolished as a result.
In League of Legends it's possible to do this with any character though special mention goes to those with gap closers. However, Zac deserves a special mention here. He's normally played as a tank, the front line for his team, and as such needs to protect the softer targets behind him. But his entire kit revolves around doing this by flying at the enemy team and spamming his soft AoE crowd control effects and strong, steady damage. Essentially, Zac protects his carries by charging in and making a royal mess of things, thus making him stand out, not only as an intentional version of this trope, but oftentimes a successful one.
Averted in Doom and Doom II , due to the sheer number of enemies especially in some third-party levels which can have hundreds of demons. Often the only viable strategy is to take advantage of enemy fratricide by rushing in, stirring up as many demons as possible, and then either finding a place to hide or being incredibly good at dodging while a huge demon-on-demon melee commences.
An example of an enemy doing this is the Muton Berserker in X Com Enemy Unknown. It uses melee weapons instead of the standard plasma guns used by the aliens, and will charge towards any of your squad who damage it. While its melee attack is devastating if it closes the gap quickly enough, the fact that it doesn't utilise cover, combined with its vulnerability to Overwatch fire and the Assault class's Close Combat Specialist skill, means it often gets killed before it lands a hit.
In the Multiplayer Online Battle ArenaSmite, tanks are often expected to do this to initiate team fights, enduring the enemy team's abilities so their squishy members don't have to. However, Kali seems to have been built around suicidal Leeroy Jenkins-style kamikaze rushes. Kali's ultimate skill makes her unable to die for a few seconds as she rushes an enemy player. If she gets the kill, and that enemy was her designated target, she'll get almost a full heal, making it completely worth it.
Ajax, of course. The most hotheaded individual in the whole gang can be very effective at getting himself into major trouble, although in the game's most blatant case (barring the park incident that was also in the movie, of course) it wasn't entirely his fault. In the level that depicts his and Snow's first night as members of the gang, they intrude on Destroyers turf at Ajax's insistence (albeit not to fight, at least at first), get pelted with rocks in an ambush, have their trademark jackets stolen, and wind up having to take on the Destroyers' entire roster to get their "colors" back. It's initially a subversion, as Ajax and Snow manage to decimate the Destroyers' main leadership; Ajax even gets to hook up with their gang moll. But then, as they're heading back to West Coney the next morning, the moll appears on the fire escape above the street - in her underwear - and loudly bids goodbye to Ajax, attracting the attention of a very large and very angry contingent of Destroyers who chase Ajax and Snow down the entire length of the boardwalk. The Destroyers only break off the attack when confronted by all the other Warriors, and a stern Cleon lets Ajax know just how much of an idiot he is.
Cleon: Your first night with us and you're already stirring shit up?!
Vermin also threatens to become this after the Destroyers finally declare all-out war on their West Coney rivals and murder Vermin's best friend, Ash. As Cleon is laying out the gang's attack strategy, the impulsive Vermin completely loses his temper: "Bullshit! I'll kill 'em all [myself]!" He has to be physically restrained by the other Warriors.
(1) You have swift reflexes, since by the time you see him charging down the hall towards you on camera, you'll have about half a second to shut the door on him and closing the camera takes up most of that time.
(2) You pay attention to Pirate Cove frequently to prevent his triggering from happening in the first place.
Shirou in Fate/stay night, several times. Most notable? Charging out of cover unarmed at Gilgamesh in order to save a girl. A girl who just had her eyes slashed and a lung stabbed. And he didn't know her, and she was clearly about 30 seconds from death. Oh, and Gilgamesh just killed Berserker at least thirteen and more like thirty times in terms of damage without getting scratched. Or moving.
Saber pulls an impressive one way back in the Fate scenario, where refusing to take the fight to the enemy will prompt her to rush off by herself. Especially irksome since this is what you actually have to do. Agreeing to go with her makes her more cautious, but gets Shirou killed by a third party. If you try and refuse, the delays involved mean said third party is not present when very similar events go down, resulting in a better outcome.
Wocky Kitaki in Apollo Justice: Ace Attorney claims to have been shot in an ambush, but he is soon revealed to be a Leeroy: "according to my sources... 'you ran in 15 minutes before the appointed time... by yourself.'"
The Leet World's Ahmad acts like this early in the series. His enthusiasm gets fellow terrorist Ellis killed in the first challenge (he got better). In the mid-season finale, he tosses a grenade into a room full of fellow housemates after hearing gunfire, seriously injuring Player.
Subverted in that the World of Battlelore: obsessed Counter-Terrorist Leeroy is quite cautious and level-headed.
The BLU Scout in Scout Combat doesn't understand how to run in anything but a straight line.
All it takes for the Sniper to avoid the W+M1 Pyro is to just move out of the way, and watch him hurl himself off a cliff.
In Red vs. Blue, Agents York, Maine, and Wyoming once had a three on one sparring match with Texas. York tries to coordinate his team, but Maine and Wyoming just keep ignoring him and charging forward, getting their asses kicked.
Rose Lalonde shows increasing shades of this throughout the comic.
John does it once. To be fair, he does so as the result of some meddling on the part of the trolls convincing him it's a good idea.
Karkat doing this also had dire consequences, since he thought that the frog breeding in his session was taking too long. Turns out his impatience gave an entire universe cancer and directly resulted in his own session going Off the Rails. Nice Job Breaking It, Hero, indeed
Vriska invokes this trope in a doomed timeline by flying off solo to fight Bec Noir. (Though the other trolls at this point did not have much of a plan for her to ruin).
Another Shout-Out: one of the uncroaked warlords in Erfworld is named "Sir Leeroy Jenkins". Bonus: When Jenkins is destroyed in battle, Parson muses that "At least he has chicken." Not only that, shortly before then, Parson instructs the casters to have the warlords use a battlecry as he charges in: "LEEEEEEEEEEEEEROOOOOOOOOOOOY—"
One of the, let's just say they failed their psych examinations, CORE soldiers in S.S.D.D being used to test the new augmentations is Lee Jenkin. He's a clone who grew at a normal rate so he's smarter than most of his cannon fodder siblings but that doesn't mean he's sane.
Yuri from Exterminatus Now. She has no patience for complex planning (and even then, that's stretching it — she can simply not understand any plan beyond "Target that way") and tends to do whatever comes into her head, which frequently gets the gang in trouble. Kinda lampshaded when Rogue gets back. He tells everyone else that there is a reason why Yuri's codename is "Wildfire".
Rogue: I thought about warning you, but then thought "Fuck those guys."
The Chief is being tortured by the very scary antagonist paladin Kore, in order to bait the rest of the Goblin party into facing him. Fumbles chooses that moment to snap out of his Heroic BSOD, and rushes to his Chief's aid, unarmed, against the paladin that the entire party was running from moments ago, screaming a battle cry as he goes.
Dizzee Jenkins of My Life At War has a reputation for being foolhardy and rushing into battle, losing at least one LIMB each deployment. After losing two in one particularly suicidal battle his boss informs him that his liability balance is so far in the red that it'll take him 67 years to pay it off.
What happened when some of the PvP gang teamed up with an outsider.
One of the NPC's in Open Blue is Lance Corporal Jenkins, a member of Avelion's special forces. How he managed to get in the special forces, moreover survive multiple operations is generally regarded as a miracle.
Evan, The Big Guy of Everyman HYBRID, prefers to run headlong atthe Slender Man rather than away from him. The first time he tries it, Slendy just disappears. When he does it again with a baseball bat, he gets mind-crushed and left to stumble around with blood in his mouth.
HABIT: Evan? He's just an animal. He just runs in, doesn't care what the fuck's going on, he's an idiot.
His Armada counterpart, Hot Shot, also had a tendency to do that.
And was still at it in Cybertron. Overhaul also has elements of this.
In various incarnations of Transformers, this is the consistent character trait of Cliffjumper. He's always itching for a fight and always the first to leap into action — even if, as his name suggests, that leap is off a cliff. This is especially true of G1 Cliffjumper and Prime Cliffjumper. Establishing Character Moment: From the first episode of Transformers ever...
Cliffjumper: I'm goin' too... I wanna blast Megatron right in his Turbo-Charger... Optimus Prime: Just find them. We'll deal with them later... (Hound and Cliffjumper travel to the Decepticons' Rocket Site) Hound: Cliffjumper, what are you doing? Cliffjumper: I've got Megatron dead-center in my view finder... Hound: Remember what Prime said: Just find them. Cliffjumper: (fires and misses, alerting the Decepticons that they're being watched...)
Air Raid's motto is "If you look first, you may not leap", and he lives by that code with all his spark.
William has his Leeroy Jenkins moment in episode "Final Round", during his first virtualization on Lyoko. So eager for clashing with the monsters, he never listens to Aelita's repeated calls for caution or Jérémie's orders of drawing back, and ends up captured and brainwashed by the Scyphozoa.
Odd has his moments, too, several times. Usually lampshaded by Ulrich: "[Odd's] nuts."
Grossology. Ty can be considered one, and probably the worst offense was going to a garbage dump without waiting for orders. This led to his being brainwashed by Fartor, and it took a lot of effort from his sister Abby to save him from the "fart side".
Shredder in the original Teenage Mutant Ninja Turtles was always a threat to ruin Krang's well-laid plans by letting his hatred of the Turtles overtake him:
In "The Big Blow Out", as Krang was on the verge of sending Earth into Dimension X, Shredder drove the Technodrome after the Turtles, falling right into their trap that sent the Technodrome into Dimension X instead.
"Shredder Triumphant": Shredder and Krang appeared to have pulled off perfect plan when they captured the Turtles and banished them to Dimension X. Then Shredder brought them back to Earth himself after they taunted him into believing he hadn't really beat them unless he actually fought them.
Superboy gives a perfect example, (except he yells rather than shouts his name) in "Performance". The team has a plan to take down Parasite... which Superboy promptly screws up by charging in screaming. Interestingly, here it's an Out-of-Character Alert and a sign that Superboy is using the shields, as Superboy had long since grown out of this.
Arsenal in his first real episode. Covert ops mission? He feels like spiting Luthor, so he blows up the lab.
The Amazing Chan and the Chan Clan: Flip and Scooter Chan are prone to this quite a bit. (Oddly enough, though, in one episode Flip himself was the one to keep Scooter from running off before they had a plan)
Rainbow Dash, on a several occasions. When facing down a Hydra in "Feeling Pinkie Keen", Twilight wonders, "What would a brave pony like Rainbow Dash do?" Answer? Charge headfirst at it. In "Dragonshy", she kicks a dragon in the face. A dragon about fifty times her size, mind you.
In "Daring Don't" we have the following:
Rainbow Dash: We've got to help Daring Do retrieve the ring for safekeeping before it's too late! Twilight Sparkle: Okay. But sounds to me like we're in way, way, way over our heads. We're going to need a carefully thought-out plan... Rainbow Dash:[Flies off] I'm coming, Daring Do! Twilight Sparkle:[Annoyed] That's not a plan!
And again in "Power Ponies," when the Mane 6 arrive at the villain's headquarters:
Twilight Sparkle: All right, Power Ponies, here's the plan. Rarity, you, me, and... Rainbow Dash: Come on out, Mane-iac! Or the Power Ponies are comin' in! [thunder crash] Twilight Sparkle: So much for the element of surprise.
In "Sonic Rainboom" one of the contestants in the Best Young Flier competition was a brown male background character that energetically shouts "Let's do this!" right before flying out of the starting gate to do his routine. This scene gave the character a small memetic status in the fandom and the Fan Nickname "Leeroy Wingkins."
Of the Biker Mice from Mars, Modo, Throttle, and especially Vinnie fit this trope. Yes, all three of them. Charlie's strength is that she doesn't fit this trope.
Sir Sadlygrove Percidal of Wakfu. If it weren't for the fact that he is part of the main cast, his complete lack of subtlety and love for impossible odds would've gotten him killed twenty times over. Although he did die once. In fact he states he wouldn't mind dying as long as it is during a great fight.
Motorcity: Texas is like this, although he does sometimes try to come up with plans, just not very good ones (such as inventing a shrink ray).
Blitz pulls this in the second episode of Road Rovers right after Hunter says they need to figure out a way to get into the enemy base ("Let the biting begin!"). He did get inside, though... after being knocked out from a distance by a gas grenade and taken prisoner by guards.
Phineas and Ferb essentially recreate the original viral video with Buford in the title role.
Static Shock may be pretty smart, but he falls into this on occasion. In one episode, the Old Superhero Soul Power, who has Shock and Awe powers like Static, contacts him and warns that his arch-enemy Professor Menace has resurfaced. Static overconfidently charges into battle before Soul Power can stop him. He gets his ass kicked and has to be bailed out by Soul Power. Annoyed, Soul Power asks if he was even paying attention: Professor Menace is his arch-enemy, so he has a lot of experience dealing with guys who can control electricity.
Dastardly and Muttley in Their Flying Machines: In "Zilly's a Dilly", Dick Dastardly hires a hypnotist to make Zilly brave. Unfortunately, Zilly becomes too reckless to follow plans and Dastardly decides to turn Zilly back into a coward.
Ewoks: Paploo does this quite often, which eventually gets him in trouble in The Three Lessons, when he's held captive and tickled repeatedly by the giant Stranglethorn plant.
Truth in Television: in real life there were quite a few battles that the losing side could have won if some of the troops didn't attack or charge before the order was given.
See, for example, the Battle of Bannockburn. The English army included large numbers of archers, who could potentially have massacred the Scottish schiltrons with little difficulty. Instead, the English knights charged en masse and were slaughtered.
And a more extreme example of the same mistake was the Battle of Crécy, at which, according to some accounts, the French knights actually rode over their own archers, such was their eagerness to get to grips with the English. Who shot them down by the hundred. Made worse when the French commander ordered his crossbowmen forward, without their pavises (big, thick shields) that they would normally crouch behind in safety while loading their crossbows. The French commander was eager to start immediately heedless of a plan. The crossbowmen got cut down like grass to a lawnmower and started to retreat, enraging the commanders — who ordered the knights to charge over them, and they got bogged down in all the bodies, letting the English cut them down as well.
Genghis Khan made Leeroy Jenkinses out of just about every army he or his generals came across, mainly due to their perfected use of the Defensive Feint Trap. On the steppes of Mongolia, it had been a common military and psychological tactic used by steppe tribes, which had, up until Genghis Khan united them, had constantly battled each other and thus had a lifetime of experience using and anticipating the tactic in order to keep their troops from breaking loose and running into a trap. Pit that against armies that generally either lacked the understanding of Mongolian tactics such as fake retreating (or should have but looked down on the Mongolians as being too uncivilized to be victorious), and/or were hastily conscripted with inexperienced, many times malnourished peasants that knew little of military tactics to begin with and who would many times just be made to Zerg Rush an enemy? The conquest of nearly one-fourth of the entire world in the half-century that followed from countless fake routs during battle - even when they were outnumbered several times over - basically speaks for itself.
The Battle of Nicopolis in the 15th century, also known as the Crusade of Nicopolis, where the French Knights (does anybody see a pattern here?) disobeyed orders from the crusade leader (King Sigismud of Hungary), who asked them to wait two hours until the Wallachian scouts, led by their prince Mircea the Elder, returned. The French accused Sigismund of wanting to hoard all the glory and charged. While they were successful at first, overrunning the inexperienced infantry that sultan Bayazid used as bait, they were soon attacked by archers and impaled their horses on a row of spikes that the Genre Savvy Bayazid had prepared the night before. Did the French retreat? No. They just dismounted and attacked the Janissaries on foot, beating them. Did they now have a break and rest and regroup? No. They attacked the Turkish elite Sipahi cavalry behind the Janissaries on foot, and inevitably came out second best. A lot of French high nobles died that day. Mircea the Elder, being Genre Savvy himself, knew the battle was lost when he saw the French charge and led his troops away from the field and over the Danube, to defend Wallachia from Bayzid's inevitable counter-attack once he was done slaughtering French knights.
Some of the least favorable interpretations of France's 19th century army doctrines, at least those established by Jomini, could probably be defined as turning the French army into a force of Leeroy Jenkins. His book's publication expenses were footed by a revolutionary general, Michel Ney, who also went down in history as this. The French call it élan. It's been suggested as one of the reasons World War One surgically removed France's then-legendary taste for war after too much élan led to one of the worst death tolls in the war.
Older Than Print: At the Battle of Hastings in 1066 a group of Norman soldiers, fearing that their Magnificent Bastard William the Conquerer (who, by the way, reallywasa bastard) had died, began to break and run. A detachment from the Saxon shield wall ran after them, and was promptly annihilated when William ripped off his helmet to show the fleeing knights he was alive, rallying them. Then the Normans decided to try a couple of fake retreats. Each time, the Saxons fell for it hook, line and sinker, whittling away their forces bit by bit. Had the Saxons wised up and held their shield wall, William may have had to back down, and the course of English history might have been radically different.note Harold's brothers, who were commanding the flank of the army, were both killed, leaving the flanks both enraged and leaderless. Harold himself had used the feigned retreat only a week earlier to defeat the armies of some rebellious Earls, allowing him to face William with his whole army, and presumably would have recognized the tactic if used by his opponent. But Harold was too far away to realise what was happening on the flanks, meaning by the time he could've found out that the flanks of his armies were chasing the Norman army down the hill, it would've been too late to command them to stop.
It occasionally works the other way, too. At the Battle of Missionary Ridge, the original plan was to stop and regroup, but the soldiers in the front line simply kept going. Considering what happened to start the second phase of Missionary Ridge in the first place, it makes the fact that it ended as a Union victory even more awesome:
(General Phil Sheridan pulls a flask from his pocket and toasts the Confederate artillery on the ridge) General Phil Sheridan: Here's at you! (the Rebels open fire on Sheridan and his staff, but only manage to shower them with dirt and make Sheridan furious) General Phil Sheridan:THAT WAS UNGENEROUS!I'LL TAKE YOUR GUNS FOR THAT!
Encouraged by Sheridan's shouting, his soldiers charge up the hill towards the Confederate guns, shouting "Chickamauga!" "as though the name itself were a weapon" in the words of Ambrose Bierce (the recent battle at Chickamauga was a Union defeat, so it was a cry for vengeance). This reckless advance worries the commanding Union general, Ulysses S. Grant.
General U.S. Grant: Who ordered those men up the hill?!
One of Grant's Aides: No one. They started up without orders. When those fellows get started, all Hell can't stop them!
Another highly famous incident in the American Civil War was at Gettysburg. General Dan Sickles, notorious Jerkass extraordinaire, completely ignored orders on the second day given by General Meade, and moved his entire corp forward out of fortified position to engage the enemy. His entire corp was virtually destroyed in the ensuing battle, though he may have inadvertantly saved the entire battle for the Union—General Longstreet was marching his soldiers for a coordinated attack on the Union left while Ewell attacked the Union right. Sickles' sudden movement spooked Longstreet, causing him to countermarch, and march a different route under heavier cover, wasting several hours in the process, and allowing Union forces to move quickly to counter both attacks.
An awful lot of the maneuvers in the American Civil War Battle of First Bull Run/First Manassas had a lot of Leeroy Jenkins moments, especially in the case of General Daniel Tyler, ordering a headlong attack by two of Keyes' regiments on the Confederates on Henry Hill without consulting General McDowell. It didn't go so well. This may have been the result of supreme overconfidence; both sides thought the war would begin and end in a matter of weeks; Lincoln's initial call for troops included only a ninety-day commitment.
Lieut. Col. George Armstrong Custer may or may not be an example, depending on what interpretation people have of him; in Lost Triumph by Tom Carhart, Custer was a beloved and capable leader, particularly at Gettysburg where his unit prevented the reinforcements from arriving on scene that would have turned Pickett's Charge from a colossal screw up into a gamewinning masterstroke. Custer was a major general at 26.note The 'major general' title was a temporary wartime rank. In Feb. 1866, he returned to his then-rank of captain. He was given 'brevet', or temporary, major general rank just before Little Big Horn. After the Civil War, Custer's career moved towards more Leeroy Jenkins-type behavior, culminating in the battle of Little Big Horn.
Custer's attack against J.E.B. Stuart's cavalry at Gettysburg was incredibly risky, but it was well planned. Custer's brigade was greatly outnumbered by Stuart's division. But Custer also knew the field well and chose the spot to attack that did the most to nullify the advantage of numbers. Custer didn't need to take out Stuart, just prevent him from reaching the main battlefield, and to do that Custer charged headlong into the front of Stuart's column and had his horses literally collide with Stuart's. With Stuart's own front line in the way of the rest of his forces joining the fight, there was no direction available to veer away from their path to the main Gettysburg battlefield. Thus, the cavalry reinforcements that Picket was relying on never arrived, and the Union infantry (initially thrown into disarray) was able to rally back and crush Picket's outnumbered infantry.
The Charge of the Light Brigade was a Leeroy Jenkins moment made epic by a well-known poem by Lord Tennyson. Though it was caused more by a failure to communicate than actual impatience (some historians have suggested that the British soldiers were intoxicated), and that although the actual charge was a complete disaster, it did have the lasting effect of convincing the Russians and the rest of the world that British soldiers were completelynuts, especially since their commander was under the impression that he was supposed to make a Heroic Sacrifice and saw no reason to hold back. And then the French Chasseurs d'Afrique pulled a Leeroy Jenkins themselves, broke the Russian line and covered the retreat of the Light Brigade, saving their sorry asses. Earlier that same day there was also the maneuver now known as the Thin Red Line, which basically was when the Russians tried a Leeroy Jenkins of their own and got humiliated for their trouble, by a two-men-deep line of Scotsmen, no less.
The same thing happened at the Battle on Minden (1759), when a misunderstood order sent a brigade of British infantry advancing on the French lines, and despite everything the French could throw at them, won the day.
Less well-remembered from Balaclava is the Charge of the Heavy Brigade. At a key point in the battle, the British Heavy Brigade charged uphill against a numerically superior Russian force (ordinarily a compound tactical error) and won.
Subverted by King Charles XII of Sweden in the battle of Narva 1700. His 4,000 Swedes charged impetuously against 40,000 Russians and won. Tsar Peter I simply could not believe the Swedes would charge, even less seek battle against such odds.
Partially subverted at the Battle of Omdurman when the 21st Lancers charged what they assumed to be a few hundred dervishes, only to find they'd run into about 2,500 of them. Fully subverted in that they still won, despite being outnumbered >6-1 (of the 400 strong 21st Lancers, 70 men and 120 horses were lost).
Horatio Nelson, at the Battle of Copenhagen (1801), had something of a Leeroy Jenkins moment. While leading the advance squadron, several of his ships ran aground and his commanding Admiral ordered him to abandon the assault. While trying to read the signal flags, he purposely put his spyglass to his blind eye, said "I really do not see the signal," kept attacking, and won the battle.
This one worked out fairly well though.
Admiral Parker knew Nelson would keep fighting as long as he saw a chance to win. He also knew that Nelson would make a Heroic Sacrifice unless ordered to retreat. Finally, Parker couldn't see the damn battle owing to all the gunsmoke in the air; he had no idea what was going on, and he was well aware of it. So he put up flags indicating that Nelson had permission to withdraw if he so chose—tacitly giving permission to remain as well. Nelson interpreted it correctly, and the whole "disobeying orders" thing came up later because it makes the story seem romantic. (Not that the bit with the blind eye helped matters.)
Gerhard von Blücher, Prussian marshal during the Napoleonic Wars (the one that saved wellington at Waterloo), was famous for this. His nickname was Marschall Vorwärts (=Marshal Forward).
At the Battle of Ain Jalut, a Mongol army that really should have known better (since it was a favourite tactic of theirs) charged blindly after some fleeing Mameluke horsemen and were totally destroyed. Especially painful since it was the only Mongol army for about a thousand miles at the time, and had been specifically placed there to keep the Mamelukes in check.
Hitler had this going several ways. He picked on Czechoslovakia, which scared his generals as the Czechs had a fair shot at beating the German army in the condition it was...but got away with it because the rest of Europe abandoned the Czechs and their morale collapsed. He went to war with France and England about two years before his navy and army thought they were ready for it; the army wanted more time to reequip with the Panzer III, and the navy projected a need for about 120 submarines to win the war, but only had 42. He topped it by attacking Russia before he'd knocked England out of the war or worked out how to actually use all that extra industrial output and manpower in occupied Europe, which might have given a him a fair shot at the Russians. He then topped that by declaring war on America just as the Russians started their first round of winter counterattacks, thereby pitting Germany against not one but two enemies it was incapable of defeating.
In fact, the Germans had bitten off more than they could chew even before they attacked the USA. As early as 1941, Fritz Todt led a committee of Germany's best industrialists, and they found that unless Germany doubled her industrial output, British and Soviet industrial power would leave her for dead. The entry of the USA into the war just sealed the deal.
Germany doubled her industrial output and then doubled it again, but it was already 1944.
And Hitler never seemed to take into account that: 1) If you tick off the people of the lands you're occupying, they will take exception (most notable in the Ukraine, where the people hated the Soviets — but grew to hate the Nazis worse); and 2) the sheer amount of bodies Russia alone could throw at Germany.note On this one, the USA again was the icing on the cake; there was one other country that could just throw soldiers at Germany like Russia could, and once again it was the US (the two were about the same size by population).
Meanwhile, Mussolini was busy Leeroying up Hitler's plans. While Hitler was planning on turning on the Russians from the beginning, he really wanted to finish his business with Great Britain first. Then Mussolini had to go and try to rebuild the Roman Empire by invading the Balkans (with even poorer preparations than Germany had at the invasion of Poland, to boot), a move almost guaranteed to bring them into conflict with Russia. Hitler figured it would be better to attack Russia now, while nobody was prepared, rather than let Russia call up its enormous reserves of manpower.
The Fort Hood Shooting, in which Kimberly Munley (who was praised as a hero by the media) rushed ahead and managed to get herself shot up and had to be bailed out by her partner Mark Todd who shot the shooter 5 times and disarmed him.
Hell, terrorism in general: You'll get captured or killed, and more than likely you'll turn more people against your cause than toward it.
Inverted in World War II; isolationists saw America as this. When it became obvious that the Axis Powers would attack America anyway because, ahem, the Axis Powers attacked America, nobody listened to isolationists for over two decades.
JNA at Vukovar. Sending tanks into city with no infantry support? If it isn't stupid, I don't know what is...
During the English Civil War, King Charles' nephew Prince Rupert of the Rhine became infamous for this. His wing of cavalry would charge, break through the Parliamentary lines - and then keep right on going, often for several miles, chasing a few scattered Roundheads. This worked well enough at Edge Hill, the first major battle of the war, but by the time of Marston Moor and Naseby the Parliamentary armies had learned to just let Rupert's men charge and chase a few of their number down - while the remainder regrouped and went back into a battle which had now lost a third of the Royalist army. This was a large part of the reason why the Royalists were crushed in those two battles, and by extension a major reason why they lost the whole war.
The Battle of Adrianople, (1205) with the forces of the Fourth Crusade, led by Baldwin of Flanders and Louis of Blois, versus the Bulgarian-Vlakh-Kuman army of tsar Kaloyan, ended like this. Louis of Blois had just recovered from an illness that had left him unable to participate in the Fourth Crusade's conquest of Constantinople, and he was overeager to show his stuff. When the Kuman cavalry broke and ran, Louis charged willy-nilly after them, with Baldwin chasing Louis trying to stop him. The Kumans then encircled them. Louis died defending Baldwin, who was then captured and eventually killed in prison.
Also the original Battle of Adrianople in 378, when then-Emperor Valens was threatened by Fritigern's army of goths. Valens was safely positioned in the almost-impregnable city of Constantinople, but decided this wasn't a good enough chance for a victory, so he moved his army to the much less-defensible city of Adrianople... and then moved them again to the open countryside seven hours north of the city, where he could be certain that all of the Roman Army's equipment and tactical advantage for defending a well-prepared city would be completely useless. Valens' body was never found.
City defence wasn't the issue. The Goths were plundering the countryside and killing people. As Eastern Roman Emperor and supreme commander of the Roman army, Valens had a duty to stop them. Valens had no reason to believe that he'd lose, since the Roman army was the best trained fighting force on Earth at the time, and the Goths were pretty rag-tag in comparison. However, he lost the battle because he didn't wait for backup from the Western Emperor Gratian, who was on his way from the northwest. Had he waited until the Gothic cavalry returned from foraging (which the Roman scouts initially did not know about until the battle began) and Gratians's armies arrived, victory would have been assured as Fritigern's suprise (and improvised) cavalry charge was what had lead to the humiliating Roman defeat. He also dismissed the advice of his officers, who also urged him to wait.
During World War II, in the midst of the Allied bombing campaigns over Western Europe, a young American pilot by the name of Robin Olds was scouting ahead of a large formation of bombers when he came across a large gaggle of German fighters who were forming up in preperation of interecepting the bombers. Not only did he not contact the rest of his squadron to form up and hit the Germans en masse, he actually mashed his radio key to prevent his wingman from calling out a report on the sighting. He charged headlong into the mass of German fighters, followed by his wingman, and the first moment the Germans realized they were not alone in that slice of sky was when the first pilot called that he'd been hit. This worked in Olds' favor, because the Germans were still trying to form up and get organized. The sky was full of fighters, and only a small number of them were enemies. The rest were confused and panicked friendlies who were dodging around every which way trying to figure out if they were the next target of this phantom attacker.
Sgt Dan Daly was made of this trope. as seen here. At one point during World War 1 his Marine division was taking cover in a trench while the Germans pounded them. He leaps out of the trench shouts "Come on you sons of bitches, you want to live forever?" and charges at the Germans. The entire division shortly followed him and took the enemy position with few casualties.
The Battle Off Samar, part of the Battle of Leyte Gulf in World War II. A decoy Japanese fleet baited the bulk of Admiral Halsey's fleet away, leaving Task Force 3, a small force of escort carriers and destroyers - the early 20th century naval equivalent of Red Shirts - to face Admiral Kurita's Center Force, a large formation of battleships and cruisers that outmassed and outgunned the American force by a truly staggering margin. The American destroyers attacked the larger force in order to allow the escort carriers a chance to escape, and so ferocious was the American attack, that Admiral Kurita came to the (wrong) conclusion that Admiral Halsey had not taken the bait, and would soon arrive to engage them. The Center Force retreated, resulting in one of the most unexpected victories in the history of naval warfare.
Of particular note is Captain Earnest Evans and his destroyer USS Johnston. Taffy 3 was attempting to retreat as quickly as possible with the escorting destroyers laying smoke to allow the carriers a chance to try and escape. Evans without orders turned his ship hard around and at full flank speed charged the attacking Japanese fleet alone. Not only did he close to within torpedo range he managed to take out of the battle two Heavy Cruisers right from the start. It was due to Evan's audacity that the rest of the force also made their own attack runs. To make his bravery even more awesome is that when a squadron of Japanese destroyers lead by a cruiser bored in to make a torpedo attack on the retreating Escort Carriers, Evans charged with his heavily damaged destroyer attacking the ships. His attack spoiled their torpedo run once again saving the carriers from attack. This did cost the Johnston as those ships ravaged her sinking the ship. While Evans abandoned ship with his crew he was never seen again. He was awarded the Medal of Honor.
Halsey himself provided an example of the bad form of Leeroy, ignoring the strategic mission in an attempt at tactical victory. The overall battle objective was to land US ground forces on Leyte, with the Navy providing cover against an anticipated IJN counterattack. Instead of waiting for the enemy to come to him (where he would have the help of those very escort carriers providing air cover), he rushed off to try and find the enemy in the open sea (he did, sinking some now-worthless Japanese carriers), abandoning the landing beaches and supply fleet. More than one historian has guessed that Halsey was attempting to one-up his Blue Oni and rival Raymond Spruance, who had been criticized for letting the Japanese carriers escape at the Battle of the Philippines Sea. Had Taffy 3 not made it's incredibly-ballsy stand, the Japanese heavies would have sailed right up to the landing beaches, sunk the transports, and then shelled the ground forces with near impunity until Halsey finally turned around and came back to chase them away. Aptly summarized by the commander of Taffy 3, Admiral Sprague:
"That son-of-a-bitch Halsey has left us bare-assed!"
Off of the battlefield, the 1993 Thanksgiving Day Football Game between the Miami Dolphins and the Dallas Cowboys. The Cowboys, leading 14-13 with seconds remaining, managed to block a game-winning field goal attempt from the Miami Dolphins. All Dallas had to do seal the win is let the ball roll dead. Miami was barred by rule from touching the ball again unless it was touched first by Dallas... which is exactly what happened when Defensive End Leon Lett charged in - past several teammates trying to wave him off - and tried to recover the ball. He slipped on the snowy surface and ended up booting the ball forward, where Miami recovered and subsequently re-kicked for the win.
If you've ever been on a sports team in your school days, you can remember at least one teammate who lacked to good sense to stick to the game plan, was a showboat, and/or did something monumentally stupid that cost your side a victory.
In the realm of business, Leeroy may be a positive role model. Peter Drucker, among others, recommends a "Ready, Fire, Aim" mentality, suggesting that barging forward and firing at a lot of targets can yield better (and will certainly yield quicker) results than involving a bunch of people in planning sessions to select a few targets.
Torpedo Squadron 8 at The Battle of Midway in WWII. Attacking alone without fighter cover the entire 15 plane squadron was shot down without scoring a single torpedo hit. ENS George Gay was the only member of Torpedo 8 to survive the attack. Fortunately for the U.S. Navy while the Japanese CAP was chewing up the torpedo bombers, the American dive bombers showed up and were able to attack unopposed, sinking 3 of the 4 Japanese carriers present. Fortunate timing and blind luck turned what should have been a crushing defeat into what is probably the greatest victory in the history of the U.S. Navy.
The Swedish army in most of the 17th and 18th century battles. They alwaysattacked, no matter what and into what kind of a disaster it would lead them into.
There are people who attempt to stop a criminal on their own, whether it's because they think they're helping the police or are wanting to be a hero themselves. The police strongly encourage civilians to not engage a criminal/suspect at all since said person could have a weapon or engage in a more dangerous and desperate act such as taking the leeroy as a hostage or even killing them. There have also been cases where citizens have used deadly force, resulting in arrest and trial; in some places laws like "Stand Your Ground" may be used as a defence, but in other jurisdictions it's possible one might be convicted or murder or manslaughter unless it can be proven that self-defence was invoked.
For similar reasons, many retail establishments expressly prohibit employees from attempting to follow outside the store or physically detain alleged shoplifters even if they see them blatantly stuffing things into their clothing/bags with only certain members of the staff such as Loss Prevention being permitted to detain them, both for liability reasons in case the alleged shoplifter tries to sue the store and because of anything a shoplifter might also have with them — i.e. a knife or a gun, and there's no telling what someone might do if feel trapped.
Among EMTs and other emergency medical personnel cops are notorious for running into scenes that may have hazardous materials before the scene is properly secured while neglecting to don protective equipment, and as a result often keel over after stepping inside and have to be transported to the hospital along with the people they were supposed to save. For this reason many EMTs refer to cops as "Blue Canaries" and the usual solution is to drag the cops back to the staging area (if possible) and wait for HAZMAT to show up.
The Italian Bersaglieri started out as what appeared a whole battalion of these: they were created by the Kingdom of Sardinia (the predecessor state of unified Italy) as light infantry specialized in charging enemy cavalry and rout it. Then Subverted when, between the excellent training in running, the good aim with what, for the time, were precision weapons (in fact bersagliere is Italian for sharpshooter), and the fact they were smart enough to charge the enemy cavalry on the side, they actually did it. Bonus point for doing it in the Crimean War, the same of the Charge of the Light Brigade.