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Protagonists (Broken down by game appearance)
Marco (Marchrius Dennis Rossi)
Marco joined the military's vocational school following technical high school, and after graduating, joined the Peregrine Falcons Squadron, soon becoming its leader. Though generally a good-natured guy, he tends to flip his shit whenever Morden is mentioned, given the fact that Morden was responsible for the deaths of many of his good friends.Off the battlefield, Marco is an expert computer technician, often creating computer viruses for fun, but one in particular that unintentionally made its way onto the net infected the military's mainframe, made it past all of the firewalls and almost caused the launch of several nuclear missiles. He intends to take that secret to his grave.From Metal Slug 6 onward, Marco's unique ability is to deal double damage with his handgun. If playing on Easy, though, this ability transfers over to the automatic Heavy Machine Gun. In Metal Slug 7/XX, he can also use the Burst Shot, which allows for rapid fire, though he can't move.
Marco Rossi's Tropes:
- All American Face: More or less designed as the typical American war movie hero.
- Berserk Button : Anything involving General Morden.
- Boring but Practical: His ability in the later games is dealing double damage with a handgun. While this is hardly flashy, it's invaluable whenever you're without any upgrades. In Defense, his special is to shoot his Heavy Machine Gun, which is hardly flashy but a good all-purpose skill.
- Eagle Land: He's a tanned, blonde-haired American who loves big guns and justice.
- Emergency Weapon: Starting in 6, he is focused on making the starting peashooter of a handgun not so pathetic. By dealing double damage, it's actually pretty decent. Another weapon is still preferable, but not as much.
- Extendo Boxing Glove: An alternate melee attack for when he's crouching.
- Handguns : His attack power is doubled while firing a handgun.
- The Hero: The leader of the team and the poster boy of the series.
- Heterosexual Life-Partners: With Tarma, who has been with him since the very beginning.
- "Open!" Says Me: An alternate melee attack when he opens chests is to simply kick them open.
- Playful Hacker : During his spare time. He accidentally almost launched nuclear weapons at one point.
- The Smart Guy: Outside the battlefield he's an expert hacker.
- Vitriolic Best Buds : With Tarma
- Weapon of Choice: The Heavy Machine Gun.
Tarma (Tarmicle Roving III)
Son of a military man, he entered the Special Forces Training School after finishing junior high. At age 20, he joined the Peregrine Falcons on a mission to rescue the president, at which point he met Marco, the two becoming fast friends. When he found out Marco had been selected to take part in the counteroffensive against Morden, Tarma was quick to volunteer. Though he often pokes fun at Marco, he holds his friend in the highest regard.Whenever he's not engaged in battle, he builds custom motorcycles with such attention to detail that he puts most professionals to shame. If and when he can retire from active service, he intends to open his own motorbike shop.Tarma's engineering skill from Metal Slug 6 onward allows him to make better use of the Slugs that he comes across. They can take twice as many hits, he can use the vulcan fix, the vulcan's damage is increased, and he obtains twice as many Slug Shells on pickup. In 7/XX, he can also kick Slugs, which can either recover or damage them. However, the double durability and recovery/damage kick only works on Vehicle Slugs.
Tarma Roving Tropes:
- Ace Pilot: His specialty on the team starting in 6. He's the best at handling vehicles and it translates to gameplay as tougher vehicles, stronger weapons in them, and new abilities.
- Badass Biker: Off-screen. The Cool Shades and his backstory of expertly building bikes establish him as this.
- Cool Shades: Never seen without his shades. It also helps distinguish him from Marco at a glance.
- Demoted to Extra: Becomes a supporting character in 4, but regains his playable status in 5.
- Gadgeteer Genius : He's the team's Slug expert, largely due to him tinkering with vehicles in his spare time.
- Glass Cannon: In Defense, he has the lowest HP of the four main characters but his Shotgun does the most damage.
- Heterosexual Life-Partners: He's the only character who has been with Marco from the beginning.
- Meaningful Name: As the Metal Slug technician of the team, his name last name is Roving.
- The Lancer: Marco's best friend and foil, as well as the default player 2.
- Percussive Maintenance : His Slug Kick. Sometimes averted, causing damage to the Slug instead.
- Vitriolic Best Buds : With Marco.
- Weapon of Choice: The Shotgun.
Metal Slug 2
Eri was found abandoned on the steps of a church. When she became wise to the ways of the world, she eventually ran off and became the leader of a gang of street kids. The Intelligence Department of the Regular Army noticed her leadership skills, and thus recruited her. She went on to receive spy training, and took part in a number of missions requiring assassination. She found these types of missions distasteful, and requested a transfer to the SPARROWS division. Given her impressive track record, it was approved. Once transferred to the SPARROWS division, she was assigned the role of team demolitions expert.Given Eri's background of growing up among street children, her demeanor and attitude in life mostly boils down to "Rely on nobody but yourself."Eri's unique talent from Slug 6 onward is handling grenades. She starts each life with 20, gains double grenades on pickup, deals more damage with them, and is the only one able to aim her throws, which includes straight upward.
Eri Kasamoto Tropes:
- Action Girl: Kicks as much ass as any of the men.
- Bare Your Midriff: Setting a trend, her military "uniform" exposes her belly.
- The Big Girl: While the whole team packs plenty of power, she's the explosives specialist.
- Compressed Hair: Hidden in her bandana in her sprites. Some pieces of official art would have some of her hair spew out of her back head.
- Dark and Troubled Past: We need to reiterate that her old career as an espionage agency assassin was somehow so "distasteful" that she compared it unfavorably to blowing people up with grenades and flamethrowers.
- Demoted to Extra: Becomes a supporting character in 4, but regains her playable status in 5.
- Heterosexual Life-Partners: With Fio.
- Informed Loner: She's on a four person team by the time of her introduction and does little to show off her loner personality.
- Mukokuseki: While she does have (light) brown eyes, her hair's a shade of blond that is anything but Asian, let alone Japanese (she's from Hiroshima).
- Stuff Blowing Up: Starting in 6 her specialty is grenades.
- Tomboy and Girly Girl: Eri's the Tomboy. Her backstory, attitude, and appearance are much tougher than Fio's.
- Weapon of Choice: The laser.
Fiolina "Fio" Germi
Daughter of the massively wealthy Germi Family, hailing from Italy. The Germi family has historically been a military family, sending their oldest into service, so naturally her father wished for a healthy son to carry on the name. However, following Fio's difficult childbirth, her mother was unable to bear anymore children, making it the first time the Germi heir was female.Eri's polar opposite, Fio was raised in a loving family, and has a cheerful and upbeat demeanor. Aside from her soldier training, she also studied chiropractics, acupuncture and moxibustion in university, and hopes to become a sports doctor in the future.Fio's special trait from the sixth game onward is carrying extra ammo for her weapons. She starts each life with a Heavy Machine Gun, and gains 50% more ammo on weapon pickup. If playing on Easy, though, she automatically gets the Big Heavy Machine Gun as her initial armament.
Fio Germi Tropes:
- Action Girl: No less a capable fighter than any of the men.
- Badass Adorable: Best exemplified by her victory animation of her falling down coquettishly. Mind you, this is after wiping out hundreds of enemy troops.
- Bare Your Midriff: As is the norm with female fighters in the Metal Slug universe.
- The Chick: The medical expert of the team and also the most emotional.
- Guest Fighter: She is playable in The King of Fighters: Maximum Impact 2.
- Heterosexual Life-Partners: With Eri.
- Meganekko: An archetypical example in video games. She's got the cute look, modest personality, and is overall moe because of it.
- Miss Fanservice: A lesser one compared to Sofia, but far better known among fans. Cute girl with with a nice figure (which is obvious on any piece of official art, especially next to the modestly endowed Eri).
- More Dakka: Her Specialty from Metal Slug 6 onwards. The Heavy Machine Gun is basically her default weapon.
- Small Girl, Big Gun: The heavy weapons specialist is the smallest of the four main playable characters.
- Took a Level in Badass: She's normally the meekest of the main cast, but at the end of Metal Slug 3, she stands in a very proud manner atop of a floating Metal Slug. Eri, in comparison, has a hunched demeanor.
- Tomboy and Girly Girl: Fio's the Girly Girl compared to Eri's Tomboy. She's got a sheltered background, cuter looks, and is much less hardened in general.
- Weapon of Choice: The Rocket Launcher.
Metal Slug 4
Initially, Nadia wanted to go into the modeling business, but she couldn't stop eating, which meant she kept gaining weight, so she enlisted into the Regular Army for the exercise. Here, she discovered her skills as a soldier, and was chosen to help in stopping the Amadeus Syndicate from releasing its supervirus. Here, Nadia was a stand-in for Eri, who had been assigned to other duties. The one thing putting her apart from Eri is that her alternate melee weapon is a souped-up taser, capable of shredding the enemy. Unfortunately, due to some in-game bugs, she doesn't get as many points for using her melee.
Nadia Cassel Tropes:
- Action Girl: Runs and guns with the best of them.
- Bare Your Midriff: Not that it isn't a standard with the Regular Army in general.
- Big Eater: Compared to the other characters whose powerup relies in eating, she takes it Up to Eleven. Her idle animation almost always leads her grabbing a bite on a chocolate bar.
- Formerly Fat: Well, except the ending has her eating a big feast alongside the other heroes.
- Girlish Pigtails: As evidenced by the fact she joined the military not to prove herself, defeat evil, or a love of fighting, she's just a girly girl who joined for girlish reasons. Her hair is appropriately in pigtails.
- Mundane Utility: Joining the military in the midst of conflict seemed like an easier way to lose weight than eating less.
- Rose-Haired Sweetie: She's definitely the cutie and probably the least militaristic of the protagonists, fitting her pink hair.
- Replacement Goldfish/Suspiciously Similar Substitute : The former to Eri, and the latter to Fio by pixel-art design.
- Signed Up for the Dental: Joined the military as a way to exercise and lose weight.
- Significant Green-Eyed Redhead: Rose-Haired Sweetie with green eyes in her portrait.
- Stun Guns: She uses a taser as her melee attack.
- Set Swords to "Stun": Inverted. Her taser is set to essentially killing her victims outright like the rest of the team's melee attacks.
- Weight Woe: The reason she joined the military is to lose weight, going up her needs to become a supermodel. Unfortunately this gets conflicted to the fact when she's admitted to be a known Big Eater.
Trevor received his first computer at age three. By the time he was seven, not only could he perform complex coding, he also worked on creating antivirus progams during summer break, many of which are still in use at the school he attended. When he ended up joining the Peregrine Falcons, he found a great deal of respect for Marco, whose own computer skills surpassed his own. Here, he acted as Tarma's stand-in. His melee involves kicking the enemy so hard, it shreds them apart; he gains double points for this, but he has to hold still.
Trevor Spacey Tropes:
- Armed Legs: His melee is a powerful kick called Knife Boots.
- Asian and Nerdy: Korean and a Playful Hacker.
- Bishōnen: Compared to the other male characters, he's young and boyishly handsome.
- Child Prodigy: Literally owns and uses a computer since he was three years old.
- The Cracker: Zigzagged with Playful Hacker. Becomes the Regular Army's support hacker and a sideline commando.
- Nonstandard Character Design: Sprites-wise, Trevor is the only male who normally has sclera around the pupil (most have Black Bead Eyes).
- Playful Hacker: A point which causes him to get along with Marco, another playful hacker.
- The Smart Guy: An ingenious hacker.
- Suspiciously Similar Substitute : To Tarma, who was not playable in his game.
- Weapon of Choice: The Two Machine Guns.
Metal Slug Advance
Walter joined the Peregrine Falcons squad with the hopes to train his mind and body, knowing he had the stamina to keep up with the rest of them. However, he never would've guessed his initial "training" would turn out to be a rescue mission.
- Falling into the Cockpit: An early training mission became a very real mission as his drill instructor turned out to be The Mole.
- Mama's Boy: His hobby is listed as "phoning his mama."
- Palette Swap: To Marco.
- Suspiciously Similar Substitute: Again, to Marco as the main "guy" character.
- You Gotta Have Blue Hair: His hair is literally blue. No mention is made of this.
Tyra's strong desire to fight evil is what motivated her to join the Peregrine Falcons alongside Walter. After getting the highest score on the written test, she was immediately put to the physical training course on the island where the game takes place.
- Bare Your Midriff: Not normal combat attire, even for a trainee.
- Falling into the Cockpit: An early training mission became a very real mission as her drill instructor turned out to be The Mole.
- Palette Swap: She uses an edited version of Nadia's sprites.
- Revolvers Are Just Better: Defaults to a revolver, as shown in her official art.
- The Smurfette Principle: The only female to be a member of the PF Squad. Every other female is on the SPARROW Squadron.
- Suspiciously Similar Substitute: Has the same outfit as Nadia, her hair is also a red hue, and introduced as a new female character along side a new male character.
Crossover AppearancesRalf and Clark, the Ikari Warriors, in between their appearances in The King of Fighters series, appeared alongside the core team for Metal Slug 6, and are back for Metal Slug 7/XX. Joining them in XX is Leona and Whip in Metal Slug Defense. A better amount of information about these four can be found on their respective series' page.
Aside from his participation in various fighting tournaments, little to nothing else is known about him or Clark. There's rumors flying around, but he tends to ignore them.Though carrying half as much ammo and grenades as anyone else, Ralf makes up for this with his Vulcan Punch, capable of destroying tanks, and his melee speed is much faster than anyone else's (and his normal melee can also damage things that others cannot). He's also the only character capable of taking two hits. He's just that tough.
- Dash Attack: His other special move, the Galactic Phantom Punch.
- Heterosexual Life-Partners: With Clark.
- Hot-Blooded: The guy is willing to charge a tank with his bare hands.
- Knife Nut: Collects knives as a hobby. Though ironically he's one of the few that doesn't use them on the battlefield.
- Lightning Bruiser: He can run and jump as well as everyone else, has fast (and highly damaging) melee attacks, and takes 2 hits to kill, unlike most of his allies.
- Made of Iron: Why can he take a tank shell? Just because he's that damn tough.
- Red Oni, Blue Oni: The red to Clark's blue.
- One-Hit-Point Wonder: Averted; he can take two hits.
- Weapon of Choice: The Flame Shot.
Clark and Ralf have been longtime friends, even in the unit the two of them are assigned to.Clark's unique ability is his Super Argentine Backbreaker, a special melee move capable of earning him a lot of points in a short time frame. He also gains a small window of invulnerability with each enemy he tosses with this. However, it only works on certain human-sized enemies.
- Cool Shades: Much like Tarma. Echoing Tarma's relationship with Marco, the shades serve to differentiate Clark and Ralf.
- Difficult but Awesome: If you can overcome its short range, the Super Argentine Backbraker will rip nearly any hoarde of (human) mooks a new one.
- Hammer Space: In Defense, his special move is to pull out a large Exploding Barrel and hurl it.
- Heterosexual Life-Partners: With Ralf. They've been together for years in several combat theaters.
- Red Oni, Blue Oni: The blue to Ralf's red. He's less hot blooded and more stoic.
- The Stoic: Even when suplexing enemy soldiers, he's not exactly a Screaming Warrior.
- Wrestler in All of Us: His Backbreaker.
- Weapon of Choice: The Iron Lizard.
Leona was adopted by Commander Heidern following her involuntary transformation and slaughter of her hometown, and Clark and Ralf helped to oversee her training.Leona joins the team for XX, but has to be unlocked via DLC (she's only 99 cents, well worth it). She carries an amalgamation of everyone else's skills (Stronger pistol fire, 20% more ammo and grenades, Slugs can take an extra hit, and she retains her weapons after losing a life. Interestingly, her special melee, Moon Slasher, can destroy bullets). According to her profile, Clark, Fio and Leona finished a mission that also further bonded the three as being good friends.
Leona Heidern's tropes:
- All Your Powers Combined: In XX, she has basically everyone else's special skills.
- Ascended Extra: Originally appeared in a cheap cell phone game before being moved to the main series.
- Close Range Combatant: In Defense, her moon slasher is her only move.
- Guest Fighter: She originates from the King of Fighters series.
- Signature Move: Her Moon Slasher
- True Companions: With Ralf and Clark, ever since KOF '96.
Whip makes her debut in Metal Slug Defense as part of the King of Fighters faction. Since the KOF faction does not exist in Metal Slug Attack, Whip has been moved to the P.F. faction.
- Cast Herd: Whip was separated from Ralf, Clark, and Leona in Defense, since the latter three are part of the P.F. faction. While she eventually joined alongside them in the same faction in Attack, Whip is not part of the Wrath team, rather being placed next to the Slugnoid Type-B for the Agent Sally team.
- Last Episode, New Character: Whip and Heidern were the final units implemented in Metal Slug Defense.
- Revolvers Are Just Better: Her special attack is shooting a bullet from a golden revolver. Its range is short in Defense and much farther in Attack.
- Whip It Good: Her standard attack. Her whip is able to cause knockback in Attack.
Antagonists (By faction)
- Debut: Metal Slug
- Big Bad: For most games, though sometimes he gets the title hijacked.
- Butt Monkey: Appearing on screen is usually a sign that he'll suffer a Humiliation Conga.
- Evil Laugh: Tends to laugh in a mocking tone upon approaching the player.
- Eyepatch of Power: The man certainly looks imposing thanks to his eyepatch.
- Final Boss: Of the original and of 7/XX.
- Ineffectual Sympathetic Villain: He routinely gets defeated by the heroes, betrayed and outwitted by other villains, and all around humiliated. The only game where he wasn't overshadowed by another villain was 7/XX and he was only a major threat there because soldiers from the future came back in time to assist him with better technology.
- Joker Immunity: Despite being defeated and/or double crossed whenever he appears, he always survives to lead his army again.
- Made of Iron: When riding in the Hi-Do in the first game, he can take even more bullets than Allen O'Neal.
- Made of Plasticine: Applies to his troops.
- Not Me This Time: Against all expectations, he is not the main villain of 4. The Amadeus syndicate actually abuses this expectation, having robot copies of both Morden and Allen.
- Too Dumb to Live: He allied with the Mars People a second time in 3 despite them betraying him in the last game. It goes as well as you'd expect.
- Well-Intentioned Extremist: Distraught over the death of his son in a terrorist attack that could have been prevented and angered at corruption in the Regular Army, he abandoned the Regular Army and formed his own terrorist group, the Rebel Army, and while he plans on removing corruption from the world, his ultimate goal is to create a world wide military dictatorship.
- Debut: Metal Slug
Allen O'Neal tropes:
- A Day In The Lime Light: He's the player character for the (Japan Only) Metal Slug: Allen's Battle Chronicles game and its enhanced American port, Metal Slug Mobile 3.
- Annoying Laugh: When he's not taunting the player, he usually can be heard going "AHAHAHAHAHA! AHAHAHAHAHA!"
- BFG: Wields a large machine gun whenever he's fought.
- Boss Banter:
- "C'MON, BOY!"
- "YOU'RE MINCEMEAT!"
- The Dragon: To Morden. Also doubles as The Brute.
- Engrish: "GO HOME TO MOMMY!"
- Joker Immunity: Like Morden, he always keeps coming back, despite having been riddled with bullets and falling to his death in the first game, the second having him fall down to the ice water but apparently getting eaten by a giant Orca. The third game doesn't have anything notable besides him collapsing and falling about twenty feet, but his body still vanishes like regular enemies do after the fight.
- Lightning Bruiser: Despite being bigger than the playable characters, he's also faster than them.
- Implacable Man: He cannot be stopped. Just shooting him alone is barely going to phase him.
- Improbable Weapon User: Get too close to him and he'll slap you with the ammo belt of his machine gun.
- Large Ham: He's the only character in the Metal Slug franchise to actually have spoken lines. And they are ALL taunts!
- Made of Iron: He's a human (except in 4), just like the player characters. Unlike the player characters, he has an obscene amount of health for a human, being able to last longer than a tank!
- See You in Hell: His death cry.
- Turns Red: His skin turns red as he takes more damage and speeds up.
- Unexplained Recovery: All the time. Bonus points for Metal Slug 3 having him return during the attack on the Mars Peoples' Mothership despite you apparently killing him in the same level.
- Debut: Metal Slug 7/XX
- Debut: Metal Slug Advance
- Debut: Metal Slug 2/X
Mars People Tropes:
- Aliens Are Bastards: They just want to conquer and destroy without much backstory.
- Alien Blood: They bleed green.
- Chronic Backstabbing Disorder: They betray Morden twice, for no reason other than because they can.
- Everything's Squishier with Cephalopods: Resemble giant squid or octopi.
- Expy: They look exactly like H. G. Wells' martians.
- Flying Saucer: Their main vehicle. Their mothership is an even bigger one.
- Giant Space Flea from Nowhere: In Metal Slug 2. Not so much in X, where they are foreshadowed better.
- Hoist by His Own Petard: Both their betrayals of Morden and the Rebel Army lead to an Enemy Mine that causes their defeat. The first time because a pilot from the Rebel Armor rams their mothership and forces it to retreat, the second because the Rebel Army provides the player character with a rocket that allows them to reach their mothership.
- Last Episode, New Character: They show up in the last level of 2. Averted in X where they appear in earlier levels.
- Ray Gun: They wield these, just like classic aliens... although said guns tend to fire out slow, homing, destructible nucleus-like projectiles.
- Starfish Aliens: They resemble giant jellyfish/squid. Yet they have skulls, green blood, and mouths.
- Debut: Metal Slug 3
- Big Bad: Of 3.
- Eldritch Abomination: He may look like E.T., but he does it Lovecraft-style.
- Final Boss: Of 3.
- Free-Fall Fight: You fight him while you and the soldier you rescued (and another player, if any) fall down to Earth.
- Good Scars, Evil Scars: He has a number of Frankenstein-like stitchings on him.
- Greater Scope Villain: He's the one who masterminded the alien invasion in 2/X but was not seen in the game. You do fight his mothership, however.
- Large and in Charge: The normal Mars People are human-sized, he takes up most of the screen you fight him on.
- My Brain Is Big: Bonus points for it actually being visible, encased in a dome.
- Psychic Powers: Fitting for an alien with a giant brain, it has psychic powers.
- Super Intelligence: Part of the reason he's the leader of the Mars People.
- Debut: Metal Slug 5
- Expy: Of the Rebel Army. Most of the enemies are even edits of Rebel soldier sprites. They're also one to the Brotherhood of Nod.
- Knight of Cerebus: While Metal Slug 5 has most of the series usual silliness, the Ptolmaic Army's typical soldiers lack the silliness of the Rebel Army.
- Power Copying: They specialize in stealing technical plans from the Regular and Rebel Army.
- Religion of Evil: They are led by Ptolmaic Shamans, and apparently worship Evil Spirit Incarnate.
Evil Spirit Incarnate
- Debut: Metal Slug 5
- Attack of the 50-Foot Whatever: Aside from the Mars Peoples' mothership (which is big enough to serve as an entire stage), it's easily the largest boss in the series, which is no small feat by any means.
- Autobots, Rock Out!: The battle against the Evil Spirit Incarnate has a heavy metal remix of the "Final Attack" theme.
- Background Boss: Spends most of the fight in the background, and you have to shoot the glowing skull on its chest.
- Big Bad: Is presumably this for 5, but we may never know.
- Dramatic Thunder: Thunder and lightning strikes when the boss makes its appearance.
- Eldritch Abomination: A gigantic demonic creature that looks like it was made from the fabric of space itself. It also has a skull in it's chest that serves as it's weak point.
- Generic Doomsday Villain: Even by the standards of this series.
- Giant Space Flea from Nowhere: Seriously? Where the hell did this thing come from? There's no explanation if it was allied with the Ptolemaic Army, or if it was their leader, or if they were a Religion of Evil and its their God of Evil they were summoning to bring about The End of the World as We Know It.
- Knight of Cerebus: Whatever this thing is, it's design is very much Darker and Edgier compared the usual bosses that appear in the series and is actually very menacing.
- Playing with Fire: Most of its attacks will burn you to death should they kill you.
- Screw This, I'm Outta Here!: It doesn't die when defeated, it just flies away into the background.
- Sinister Scythe: Which appears to be forged out of flames.
- Debut: Metal Slug Attack
- Debut: Metal Slug 6
- Aliens Are Bastards: Even moreso than the Mars People.
- Evil Is Visceral: They have an organic lair as opposed to the Mars Peoples' technological one.
- Food Chain of Evil: Think the Mars People were deadly? These guys literally eat Mars People for breakfast.
- Giant Enemy Crab: The Crab-tanks and Vanguards.
- Knight of Cerebus: The Mars People have an Oh Crap! reaction when they show up and eat them at the end of Mission 2. The final mission also has a Dark Reprise of the classic "Final Attack" theme.
- Heli Critter: The Smashers, which spin their legs to fly in the air like a helicopter before inflating themselves to crash down on you.
- Debut: Metal Slug 6
- Background Boss: Most of the boss is in the background- you need to attack her head to damage her.
- Big Bad: The leader of the Invaders in 6.
- Disney Villain Death: Falls to her death before explodes in a massive explosion.
- Eye Beams: Purple ones that aim at you.
- Final Boss: Of 6.
- Flechette Storm: Has an attack where she charges energy then releases it in crescent projectiles. Then they fly at the player from the left and right, or may even converge on them from all directions.
- Hold the Line: The final part of the battle turns into a Free-Fall Fight where she's invulnerable, sending huge waves of destructible projectiles dowanwards at you.
- Large and in Charge: She's one of the biggest Invaders there.
- Trick Boss: You face off the pod she's encased in. It stays there, doesn't do anything, and is periodically accompanied by Venusians. When beaten, a bunch of Morden soldiers come in to celebrate with a victory music of sorts... and then her eyes light up and destroy the soldiers. Time for the real boss.
- Debut: Metal Slug 4
- Debut: Metal Slug 3D
- Affably Evil: Speaks in a very polite and calm voice.
Pharaoh's Arc and the Mummy Army
- Debut: Metal Slug Attack
Tropes for all three characters:
- Actually Four Mooks: Subverted. While the Pharaoh's Arc consists of multiple mummies on a chariot, they are all part of the same unit.
- Enemy Summoner: The Mummy Cat's attack is to summon mummies that spit out poison bombs. If her third skill is unlocked, enemies hit by them have a chance to be stunned.
- Kill It with Fire: The Mummy Warrior uses a long torch as his weapon.
Support Characters and other notable NPC's
Rumi and Madoka Aikawa
Rumi originally joined the Regular Army to make use of their medicinal facilities to help her ailing mother, who had a weak heart, and her twin sister Madoka, who was physically ill. Due to a paperwork SNAFU, she was shipped to the front lines, and despite having never completed her training, she made it back unscathed, a miracle in and of itself.She was offered the chance to leave and live life as a civilian, but she declined the offer, and was soon transferred to the Supply Division. Before each mission, she fills her backpack with various supplies, and treks out to deliver the goods to Regular Army Soldiers... but there's one problem. She's horrible with directions, and is likely to wander off and be found in a completely different location, earning her the nickname "The Wandering Ghost" by most soldiers. She later found out her sister Madoka also joined to become more physically fit, and was also placed in the Supply Division..... and shares the same atrocious sense of direction her sister has.Though mostly a background character in the main games, Rumi was given a bigger role in Metal Slug 3D, giving information to Marco and even allowing access to a Garage where the player could customize their own Metal Slug vehicle.
Rumi and Madoka Aikawa tropes:
- Action Girl: Promotional art for Metal Slug Defense shows Madoka parachuting while operating a bazooka. She is not a unit in Defense nor Attack.
- Butt Monkey: A minor one, tagging either one of the sisters will cause them to fall to the floor (shooting their backpack just tears their backpack open). This also occurs when the player taps on Rumi on both tower defense games.
- The Medic: Rumi is seen in the bad ending of Metal Slug 4 taking care of the characters who got caught in the final mission's explosion. The Recovery Support in Metal Slug Attack represents her in a nurse outfit.
- Older Than They Look: Despite being a Palette Swap, Madoka is eleven years older than Rumi.
- Out of Focus: Rumi has had more game appearances and cameos than Madoka. In both tower defense games, Rumi is the one who generates AP in the field, while in Attack only, Madoka appears in the item support menu.
- Palette Swap: Madoka has brown hair and grey attire compared to Rumi's blonde hair and green attire.
- Pint-Sized Powerhouse: Both walk and carry an overly large backpack holding various ammunition and food items. Downplayed as they seem to be struggling to keep balance.
- Unusually Uninteresting Sight: Both sisters tend to wander the active battlefield without any care. It is not until they see one of the protagonists where they bail out of there.
A Second Lieutenant of the Regular Army, he's a living legend among the soldiers. Pretending to be a captured POW, once he's "rescued" by the player, he helps out by firing homing Hadokens at the enemies and spin-kicking anyone else who gets too close. He will flee if you die, though.
Hyakutaro Ichimonji tropes:
- Kamehame Hadouken: His main attack has him fire a homing hadouken at enemies. It also deals pretty good damage too.
- Obfuscating Stupidity: He pretends to be a captured POW. Once he's "rescued", however... It's noted that he does this on purpose.
An Israeli orangutan that wears a diaper and carries an Uzi.
- Badass Normal: Compared to the main characters.
- Everything's Better with Monkeys
- Gag Penis: If you look at his Idle Animation close enough, you'll notice he pulls out 3 bananas out of his diaper and eats them, after which he tries it again but pulls out his monkey dong instead, blushes and quickly stuffs it back inside.
- Stock Animal Diet: As a monkey, he eats bananas.
Combat School Instructors
The drill instructor from Metal Slug 1 (Neo Geo CD and PSX).
- Ascended Extra: While every instructor in the series shows up in Metal Slug Defense, Sophia is the only one that hosts the Combat School in Attack (along with new sprites for her).
- Babies Ever After: Margaret, the instructor from Metal Slug X hints that Sophia retires to raise a family.
- The Bus Came Back: Shows up with Margaret in the second and third Pachislot games in Japan. In the West, it is in Metal Slug Defense.
- Ms. Fanservice: There's a good amount of art dedicated to her in the art galleries of the home versions.
- Passionate Sports Girl: What made her easily excel as a member of the Peregrine Falcons. Her favorite sport is Basketball, and also dabbles in bass fishing.
The drill instructor of Metal Slug X.
- Art Shift: Her original design was of a green military dress and light brown hair before changing to a blue dress and darker hair. Metal Slug Defense uses her original design on Events and her modern design on the Combat School.
- Drill Sergeant Nasty: A jerk to you on the lower ranks, although she'll soften up as you rise among the ladder.
- Easter Egg: Touching her breasts in Metal Slug Defense will cause her to react depending what rank you are in.
- Eyes Always Shut: If she opens them, you've either impressed her, or you've made a complete ass of yourself.
- Like a God to Me: Hitting the Super Devil rank will make her admire you to the point of calling you "Her Majesty".
The first Slug in the series, and the titular Metal Slug. Capable of shooting a vulcan machinegun 360 degrees and a low-velocity round forwards but incapable of turning around, and has a reduced jump. Variations include the Type-R, which sacrifices power for maneuverability, the Experimental, which sacrifices maneuverability for power, the Type-B, which is stronger in all areas, the Bronze, which is never used by the player, and the Black Hound, a Ptolmaic-made variation the is remotely controlled and equipped iwth a laser and homing missiles.
- Armor-Piercing Attack: Any of them can acquire Armor Piercing Shells, which do extra damage against enemy tanks, and, most importantly, fly all the was across the screen and are spammable.
- All Your Powers Combined: The Type-B has the positive traits of the Experimental and the Type-R
- Backwards-Firing Gun: The SV-001 Type-R in the first level of the third game has the unique property of firing in the direction opposite the player points. This is important, since the first boss is spent frantically running away from it.
- Escape Pod: They are equipped with a floatation device, which is buoyant enough that the player can survive falling from space with it.
- Mini-Boss: The Black Hound first appears as an optional boss in 5 before becoming playable in Advance.
- Mighty Glacier: They all take two to five hits to the player's one. However, their overall slower speed and lower jump height also makes dodging harder.
- Red Ones Go Faster: The Type-R is orange.
- Suicide Attack: Pressing Fire and Jump while in it will cause it to rush forward and explode.
A sideways-walking, high-jumping slug designed for mountainous terrain. First appears in 2 and has had consistent appearances since. It is equipped with two Vulcan Cannons, as well as a third, downward facing cannon, whose ammo varies depending on the game. The standard Slugnoid and the higher-grade blue-tinted Type-B use Flame ammo, which spreads in all directions when hitting a surface, while the Walker Slugnoid and the deep-red Slugnoid Type-R fire Fat Lizards. The Type-B features even greater jump height.
- Action Bomb: The Fat Lizard ammo, used by the Walker Slugnoid and the Type-R, which is a small ball with legs that runs to the left of the player, then explodes.
- This Looks like a Job for Slugnoid: It's only ever really able to shine in situations that require more vertical movement than horizontal. In 2,, the fact that its missile travel downward means its only really useful when an enemy is directly below you. It appears to be designed with fighting the second boss of 2, its first appearance, in mind.
- Glass Cannon: While its firepower is stronger than the Slugnoid, it's very cumbersome to use, making it hard to keep it around. In comparison to other Slugs and the players it's still a mighty glacier.
- In A Single B Ound: The Slugnoid's specialty, which is improved even more for the Slugnoid Type-B.
- Jump Jetpack: Its high jumps are jetpack-assisted
- More Dakka: It has two cannons as opposed to one.
- Nerf: X makes some levels harder by replacing the SV-001 with the more awkward Slugnoid.
- Red Ones Go Faster: The Type-R, but it's still not as fast as even the SV-001 Experimental.
- Shows Damage: Taking damage causes the Slugnoid to lose a gun.
- Walking Tank: It's on two short, if stubby, legs.
A camel equipped with one or two Vulcan Cannons. First appearing in 2 to assist the player during the first Arabian levels, it leaves the player during the second. After returning when the protagonists return to the desert in 3, it remained absent from the series until Defense. It is notable for being the first animal Slug in the series. it does not carry its own bombs, so the player instead throws their own grenades while on the camel.
- Automaton Camel: Averted in one instance. After the first level of 2 or X, it will neglect to follow the protagonist, to remain near a water source. Otherwise, it is incapable of being hurt.
- Denial of Diagonal Attack: While its cannon can fire in all directions, it can't turn around. So you will only be able to throw grenades forward while on it.
- Fragile Speedster: Faster than the other tanks, and faster than the player when runnning. However, outside of elevating the player above low-ground attacks, it offers no protection.
- Lovable Coward: It refuses to follow the protagonists into an ancient tomb, or into an army of man-eating plants, but is invincible when you do have it.
- Non-Indicative Name: It's actually a Dromedary, not a camel.
- Truth in Television: Camel-mounted machine guns actually existed in real life, called zamburaks.
A tiny jet first appearing in 2, and every game except 4 since. It's equipped with two 10mm cannons which can fire 30 degrees above or below it. It's only variation is the Slug Jet, which is controlled by an NPC instead.
Slug Flyer tropes
A weaponized elephant found in a Sasquatch cave in 3. After freeing it from a tomb of ice, the player can ride to gain an advantage against invading zombies, who have slaughtered the native Sasquatches. It is capable of shooting electricity and fire from its trunk.
Elephant Slug tropes
- Fire-Breathing Diner: To gain the ability to shoot fireballs, it must pick up a hot pepper.
- Mighty Glacier: While it does not technically offer any protection, it is so tall that almost no zombies that are on the same floor as the player can hit them. Meanwhile, it can't jump is as slow as molasses.
- Shaggy Dog Story: It starts to help you after you free it from the ice its trapped in. In the end, the player either abandons it among the zombies or leaves it trapped in another pool of ice.
- Shock and Awe: It can breathe electricity if it ears a car battery.
- Trampled Underfoot: It can kill a zombie merely by walking over it.
A small one-seater sub with a high mass Vulcan and torpedoes that sink to the floor, which appears in 3 and 5. A variation, the Slug Sub, is capable of anti-air combat and has an additional supply of depth charges.
Slug Mariner tropes
- Cave Behind the Falls: One inexplicably holds two Mariners in the third stage of 3.
- Inertia Is a Cruel Mistress: It uses high-mass rounds, giving it serious difficulty when shooting from below
- Super Prototype: The Slug Sub is actually the prototype of the Slug Mariner, despite its more diverse moveset.
The Slug Gunner and its varients are considered the final evolution of Metal Slugs. Walking on two legs for mobility, or on treads for speed, this type has the highest firepower but lowest speed of common slug types. Variants include the Proto Gunner, which is an quicker unshielded version, and a multitude of mask-differentiated enemy variants. It is based on the rebel-designed LV Armor, which itself has variants in the Slug Armor and the Ptolmaic Unit.
- Awesome, but Impractical: The fact that they, unlike other slugs, requires ammo, can't shoot diagonally (some of them can do the heavy machine gun spreading motion), and takes one full second to jump makes it a liability at the worst of times.
- Double Jump: Most kinds can use rockets to boost itself once in the air.
- Pile Bunker
- Super Prototype: For those who prefer speed over mobility, the Protogunner is actually better.
Metal Slug Attack Exclusives
A treasure hunter and the daughter of Scott Amundsen, the archaeologist from the second mission of Metal Slug 2/X.
Scotia Amundsen tropes:
The former leader of the Red Goblin society before Ptolemaios came in and dismantled the group.
Red Goblin tropes:
- Laser Blade: Red Goblin's weapon.
- Meaningful Rename: Renamed himself after the society he once was a leader for.
- Parrying Bullets: His special attack is able to destroy any projectile in the sword's path.
- Robot Buddy: Follows him and occasionally shoots lasers at opponents.
- Taking You with Me: His robot will charge at the opposing army once Red Goblin dies.
A person who protects the Sand Kingdom, the desert missions of Metal Slug 2 and 3, from the Arabian Rebel forces with his trusty Slug Armor.
El Dorado tropes:
A scientist who worked for the Rebel Army before affiliating with the Mars People.
- Ambiguous Gender: Due to the Professor cloning so much, it becomes difficult to determine what gender the Professor is supposed to be.
- Deadly Disc: The Professor's special is bringing a laser saw that pierces through enemies in a certain area.
- Heel–Face Turn: Despite moving to another enemy faction, the Professor is insistent to destroy the Rebel Army and their weapons.
- Little Green Men: Probably used the same cloning properties as the player clones from Metal Slug 3, causing the skin to turn green. The Professor is also slightly shorter than the rest of the human units.
- Vague Age: Being from the future, it is unknown how long the Professor has lived throughout the various clones.
A commander of the Ptolemaic Army.
- Death from Above: Snipes units using a hover unit. Dropping her HP will lead to Dragunov dropping her vehicle onto the opposing army.
- The Determinator: Unlocking her fourth skill allows her to keep fighting on foot with part of her original HP.
- Expy: Given the choice of clothes (bikini top and low-hanging pants), gun (the muzzle resembles a Barrett .50), her hair, and how curvy she is, as well as her choice of colored hover unit, she can be seen as an expy of Gurren Lagann's Yoko Littner.
- Eye Scream: Has a scar on her left eye that seems to be permanently shut.
- Frickin' Laser Beams: Her hover unit's special attack.
- Stripperific: Compared to the rest of the army, who most are completely covered, she wears a bikini and low-hanging pants.
An A.I. made sentient due to a programming error from Marco. Alice controls and inhabits an SV-001 and is able to produce a mass hologram of herself.
An officer of the Rebel Army.
- Easter Egg: Winning a battle with Trevor showing up on either the player or opponent's deck will cause her to furiously blush while a thought bubble of Trevor appears above her.
- Evil Laugh: Part of her special attack and victory pose, although it comes out silent.
- Frickin' Laser Beams: Her weapon of choice, whose lasers come out of floating blocks.
- Villainous Crush: With Trevor.
- You Gotta Have Pink Hair
A hired supernatural hunter of sorts.
- Badass Longcoat
- Eye-Obscuring Hat: Shown in his sprites.
- Screw This, I'm Outta Here!: Blows himself up in his defeat animation.
- Teleportation: His evade animation is him disappearing and reappearing a few spaces back.
- This Is a Drill: His short-range attack is a drill attached to his gun.
- Trench Coat Warfare: His coat contains his personal Gatling gun and many mortars to place.
A female Ptolemaic martial arts instructor who happens to wield a giant hammer.
- Counter Attack: Teleports to the front of the opposing army and slams her hammer.
- Drop the Hammer: Her main weapon.
- Gas Mask Mook: As part of belonging with the Ptolemaic Army's Special Forces section. If she gets knocked back, her mask flies off her face, making her mask-less for the duration of the battle.
- Gainaxing: Shown during her walking animation.
- Luckily, My Shield Will Protect Me: Her special attack finishes off with her hammer acting as a shield for a few moments, deflecting enemy damage from the team.
- Sensual Spandex: She clearly shows it off to the player.
- Shockwave Stomp: The aftermath after slamming her hammer by her special attack.
A human Invader whose task is to investigate life-forms being energy affected by the Sol Dae Rokker Anima.
An officer of the Rebel Army. Idolized by the rebel solders, they serve as bodyguards for her.
- Bitch in Sheep's Clothing: Despite her appearance, she can be ruthless to anyone except for her sister Abigail. Her close range attack consists of freezing one of her bodyguards and using them as a shield.
- Disproportionate Retribution: During her victory pose, there's a chance Beatriz will toss a bomb on her servant if he gives her something other than an apple.
- Frickin' Laser Beams: Ice beams.
- Kill It with Ice: Her ice gun is able to transform defeated living and non-living units into snowmen and ice blocks respectively.
- Praetorian Guard: The purple rebel soldiers show up beside Beatriz to give out weapons on command. The grey soldiers are actual units a player can deploy and are essentially beefed up versions of the normal Rebel Soldier, Sniper, and Shield Soldier.
- Sibling Team: Downplayed, both sisters are placed in different teams (Abigail in "One-Way" and Beatriz in "Queen's Battle").
A mechanic of the Ptolemaic Army. Caroline controls the F-502 ShootingRay, a miniature version of the plane boss from the second mission of Metal Slug 5.
- Death from Above: The plane's standard attack.
- Fun Size: The plane the ShootingRay was modeled after would not fit the screen at its wingspan in Metal Slug 5. Here, it's a similar length to the Hairbuster Riberts.
- Gadgeteer Genius: Created the ShootingRay all of her own; Yoshino calls Caroline the Mechageek.
- Improvised Weapon: Attacks with her controller as a close range attack.
- Screw This, I'm Outta Here!: If her plane explodes before she dies, Caroline will throw a tantrum and stomp back to base.
- Taking You with Me: Unlocking her fourth skill allows the plane to do a suicide attack whenever it or Caroline loses all of their HP.