Jin Saotome from Cyberbots. Especially in his Marvel vs Capcom 2 incarnation, in which most of his kicks and punches are on fire! Even better, you can mash some buttons when taunting to make him wipe his towel on his back faster and faster until he's practically screaming his lungs out and on fire.
Metal Gear. Metal Gear? There's Snake, Liquid, all the bosses (especially Raging Raven and Fury), even Otacon gets his moments. Usually paired with large amounts of Say My Name.
Gorath from Betrayal at Krondor. He'll get it done. It doesn't matter what he has to go through or sacrifice to do it.
Perhaps the strongest force in the Super Robot Wars series, rivaled only by the Ideon Gun. In fact, one of the most useful special skills in the series is the "Valor" skill (Doubles the strength of your next attack), which in the original Japanese was called, you guessed it, "Nekketsu" (Hot Blood). In fact, damn near every character in the Original Generation games uses it, even the shy ones.
From the same game, Katina Tarask. With Attacker, Revenge (both of which increase her attack/retaliation damage once her Will level exceeds 130 - see above) and Prevail (which makes her fight better - dealing more damage, taking less, and evading more - as her mech sustains more and more damage) and the aforementioned Valor skill, she can deal out some serious hurt, usually yelling all the time (although not as much as Sanger), even when attacking carriers. "Reckless" barely describes her.
"I SAID, GET OUT OF MY WAY!!!"
Super Robot Wars also quantifies this in the form of the "Will" stat. It starts each battle at 100 and can rise to 150 based on the tides of battle. It affects combat ability a quite a lot (each point of Will is like having your Attack, Defense, Accuracy, and Evasiveness all boost by one percent of their base amount), and certain weapons and effects can only be used over a certain Will value. Certain events (like some GaoGaiGar events) will boost this up to 200 or even 250, and that's before any spirit commands.
However, the crowning glory of the Super Robot Wars series for Hot Blooded characters is Sanger Zonvolt. The series' self-styled (but highly deserving of it) Sword That Cleaves Evil, Sanger takes on all comers and owns them all. Always wielding some form of his Colossal Blade, a gigantic mecha sword that is sometimes THREE TIMES AS LARGE as his mecha, his sword is one that can cut through anything. Also armed with his many idioms and sayings, which he yells right before slicing his poor enemy in half.
"I AM SANGER ZONVOLT! THE SWORD THAT CLEAVES EVIL!"
Sanger's Heterosexual Life-Partner Rätsel Feinschmecker might initially look like a Blue Oni to Sanger's Red, but then things like this happen and prove that he's only a blue by virtue of Sanger being even more hot blooded.
Really, Super Robot Wars is absolutely loaded with characters like these. In addition to Sanger and Katina, there's also Touma Kanou (who got so hot blooded at one point that he lost control and went on a rampage), and Folka and Fernando Albark, the Grand Masters of martial arts. Though we haven't really met him yet, presumably Folka's Expy Aledy Naash will also be like this when Endless Frontier EXCEED comes out.
Even without the absolute awesomeness of Takuma Terashima's voice, Fighter Roar proved how hotblooded he was by taking out Humongous MechaON FOOT... and then we get him in the Compatible Kaiser and things just go nuts. Then it gets upgraded to the G-Compatible Kaiser, and THIShappens. HSQ Up to Eleven!
Ryusei's character description says he's an "EXTREMELY hot blooded young man". He proves it in spades.
Another Koei series that should by all rights have melted a hole through store shelves is Dynasty Warriors: Gundam. The list of Hot Blooded crazies over in the Gundam list from the Mecha Anime And Manga section is a good starting point. A short list of playable pilots who bury the needle, in regards to their personalities: Domon Kasshu, Graham Aker (as Mister Bushido), Garrod Ran, Angelo Sauper, Kamille Bidan, Judau Ashta, Dozle Zabi, Gym Ghingham, Cagalli Yula Atha, Yzak Joule, Shinn Asuka, Setsuna F. Seiei, and the Knight Gundam (yes, the Gundam itself).
Laharl and Flonne from Disgaea, and Adell and Axel from Disgaea 2. And then there's Captain Gordon, Defender of Earth!, who is guaranteed to give it his exclamation-point abusing all no matter what it is. Including picnicking.
Disgaea 3 gives us Champloo-sensei, the most badass, Hot-BloodedHome Ec teacher you will ever find. Yeah, Disgaea's one of those kinds of games.
Kim Kaphwan and his son Kim Jae Hoon from the Fatal Fury series, as well as Joe Higashi, who seems to have an exclamation point at the end of everything he says and the bandana-wearing commando Ralf Jones, also of Ikari Warriors, The King of Fighters, and Metal Slug fame. When he gets in motion (which is practically all the time), people get beat down. Sometimes explosively.
"Nothing is POINTLESS! And the reason is.....because I'm the President.... of THE GREAT UNITED STATES OF AMERICA! YEEAAAHHHH!"
—>"HOW DO YOU LIKE ME NOW!?!"
If you're in trouble... if there's not enough hotbloodedness... maybe you need to call... OUENDAAAAAN!
Or... e... b... a... e.. b.. a.. e. b. a. e.b.a. E.B.A. EBA! EBA! EBA! EBA! ARE YOU READY? YEAH!
The sequel to Ouendan is titled Moero! Nekketsu Rhythm Damashii which translates to "Burn! Hot-Blooded Rhythm Soul!"
"Hot-blooded manly passion" is a major aesthetic element of Japanese cheerleading in real life, though obviously not to the EXTREMES - like stopping a meteor or reviving a burning-out sun - that this series in particular takes it.
Nekketsu Kouha Kunio-kun - He has "Hot Blooded" right there in his series title! His whole high school is named "Nekketsu". That's one bad-ass high school.
And Kunio/Alex himself is the hero of the school, being summoned whenever a crisis emerges or a sports challenge comes up. His girlfriend can kick ass when she feels like it. Kunio/Alex isn't as known and respected as he should be, in video games...
Street Fighter's Dan Hibiki. "DOUSHITA!?" "OYAJII!!!!" It's probably no coincidence that Dan's seiyuu in 4 also voices Hayato Saionji in Ouendan 2, mentioned above.
Rainbow Mika, from the same series.
Nearly all of the fire bosses in the Mega Man Zero and ZX series are pretty Hot-Blooded, including the fire master, Fefnir. Oddly, near the top of the Hot-Blooded ranking for all six games is an ice boss, Fenri Lunedge from Zero 4. His attitude to Zero, and more importantly his voice clips, put him probably right under Fefnir himself.
Another Hot-Blooded ice boss is Chilldre Inarrabita, to a lesser extent than Fenri Lunaedge. Although he has a partial excuse in being a deliberately juvanille character (Chilldre = child[ren] + chill).
Tales of Phantasia has Cless begin the trend, pretty hot-blooded when his home gets destroyed, his parents get killed and his best friend's little sister, too. He will follow you to the end of the earth and through time to stop you... DHAOS!!
Tales of Destiny: Stahn Aileron. The boy can be hot-blooded when commanding his allies to flee. His battle cry in Satsugeki Bukouken/Final Fury is ORENENENENENENENENENENE!!!!!! Hot Blood, to the max.
Lloyd of Tales of Symphonia is very hot-blooded when provoked or his friends are threatened. He declares war on the Desians out of anger and outright said he desired to kill all of them. He also had little quarrels about beating an angel to death after he took the soul of his childhood friend, kept attacking a person who could easily own the entire party out of irritation. Granted, he cools down as the game goes on and he is nearly a stoic in the sequel, but he can still fly off the handle if he is angry enough.
Tytree Crowe "SISTER! ! !" (plus points for being voiced by Kappei Yamaguchi)
Which is highlighted even further by contrast against the dark and dreary nature of the world the game takes place in, and the general angst of other characters in the game world (especially in the expanded games and movie).
Everyone in Bangai-O Spirits, the lighthearted, plot-free DS spinoff, in different ways. Ruri is more enthusiastic, especially when the time comes to shout "Bangai-O GO!", while Masato thinks the whole thing is stupid. On the other hand, he's very confident, reckless, always ready to get to the mission already.
The new Willpower power set in City of Heroes allows for characters that have no super reflexes or resistance, but can remain up and fighting with the super-powered through sheer force of will. If that's not Hot Blooded, I don't know what is.
"QUICKER THAN THE WIND AND AS STILL AS THE FOREST! HOTTER THAN FLAMES AND MORE MAGNIFICANT THAN A MOUNTAIN!"
When one of Bang's specials, Fuurinkazan, which the above is taken from, is unleashed, the background music is replaced with his very own theme song performed by - of all people - JAM PROJECT. (Or more specifically, Hironobu Kageyama.)
Also, when using his astral finish, his burning passion ends up burning his clothes off.
Quite a few characters in Fire Emblem: Awakening sound like this in their critical quotes, some more than others but especially the males, yet no one can deny that the grandmaster of all things Hot Blooded in the entire damn franchise is Owain, aka HE WHOSE SWORD HAND THIRSTS FOR BLOOD AND BATTLE, AND WHOSE NAME SHALL BE FOREVER REMEMBERED IN THE SAGAS!
Owain's expy Odin from Fire Emblem Fates is basically what Owain would be like, were he a Black Mage instead of a Swordsman. Even his personal skill is based on his hot blood, greatly increasing his Critical Hit ratio if he's given a tome that fulfills some special criteria. Ultimately justified, since Odin is Owain, who alongside Laslow/Inigo and Selena/Severa has come to to Nohr...
In the Hoshido side there's Prince Ryoma, his son Shiro and the swordsman Hinata. All of them are passionate, emotional, and very powerful fighters on top of that.
In the Sakura Wars series, you can choose what Ogami's (and Shinjiro's) responses to various questions/circumstances are. Usually, the most proactive one will have a frame of Ogami/Shinjiro shouting with flames in the background. The hotblooded choice isn't always the right choice, but more often than not it is.
The more you select Ogami's hotblooded answers in Sakura Wars, the better you're probably doing. SpiritArmor's Let's Play of it parodies this to great effect.
Don't let his ironic name fool you; Snow Villiers is so hot blooded it's hard to find a scene he's in where he isn't being a Big Damn Hero.
God of War's main protagonist Kratos is shouting ALL THE TIME. Plus the way he fights is just raw brutality (often ending with him ripping his target to literal shreds with his bare hands).
Garlot of Blaze Union; it seems to be a requirement for a young freedom fighter such as himself to be passionate and reckless to a fault. Three years later, he's still like this, charging into lots of things scythe-first. Interestingly enough, his blood also happens to be hot as well. More apparent once he's changed his name to Gulcasa, he's physically more demon than human, as a true descendant of the demon dragon Brongaa. Burning blood, superhuman strength, and (while exerting his full power) an actual aura of fire happen to be side effects.
From Total Overdose, the protagonist Ram, aka 'El Gringo Loco', is more hotblooded than his father. A great deal of accurate puns follow from the name 'Ram'.
Asuma Shidou from Daemon Bride fights with his Power Fist burning on fire and is always yelling with full of hot blood when attacking.
Soldier: You cannot burn me. I am already ablaze with passion for war!
Goemon is a hotblooded man of Edo (despite his looks), who is always itching to beat the snot out of villains with his trusty pipe when they cause trouble. When the Japanese title of his series has "Ganbare" ("Do your best/Hang in there") in it, it's to be expected.
Wataru Hoshi from Star Trigon.
"With names like Hoshi and Big Bang, we're DESTINED TO BE IN OUTER SPACE!!!!".
Asura from Asura's Wrath is so hot blooded that he can punch and destroy a finger from A PLANET SIZED BUDDHA, all while giving out guttural roars and screams. And destroys it. English voice Actor Liam O'Brien makes him sound even MORE Hot-Blooded.
Made even more impressive by the fact that, while O'Brien plays badasses all the time, they tend to be the cool, calm, and collected type. Who knew that even the God Of All Voice Actors was capable of playing against type so well?
Alex, the protagonist of The Colour Tuesday, is a hotheaded, brash delinquent whose burning drive, implacable idealism and willingness to keep going where others give up is what drives the story at times, even as it makes her rather stubborn (in an Only Sane Woman-ish sort of way) and at times a little obnoxious.
Red from Solatorobo. Elh outright calls him "hot-headed", and he only solves one of the three riddles for the Flute, settling the first two with violence. Frequently charges in without thinking, and says some pretty cheesy things with a straight face. It helps that he's voiced by Tetsuya Kakihara.
Connor of Assassin's Creed III is young, passionate, and something of a Wide-Eyed Idealist. He views the world through a lens where injustice must not be tolerated, at any cost, and so has a tendency to charge headlong into situations without thinking. This gets him in a lot of trouble.
Though it's a bit more subdued than most examples, the Nords of Skyrim definitely have shades of this, especially the old-fashioned Stormcloaks, who will walk over whatever rules or enemies get in their way in order to fulfill their understanding of right while charging you screaming and with a huge battleaxe.
Sonic & Knuckles from Sonic the Hedgehog are pretty good examples, but in different ways. Sonic is cheeky and quick to taunt his opponents, as well as being a rather Boisterous Bruiser when in the heat of battle. Knuckles has quite the Hair-Trigger Temper and always quick to solve things with violence. The two of them get along rather well surprisingly, most of the time.
In Ryzom, player-characters can get pretty loud when they engage in melee combat with an enemy, even if said enemy is something that the character would easily kill in one hit. As far as the lore goes, the Fyros as a race are this, being the Proud Warrior Race and enjoying doing everything with gusto and enthusiasm (and also enjoying the occasional fight).
Undyne of the Royal Guard from Undertale, who does everything with maximum passion. She will randomly suplex a boulder in the middle of fights just because she can. This extends to her social interactions, making her a Large Ham. By extension, Papyrus is also this after hanging around Undyne for so long, except he mixes it with his enormous Cloud Cuckoolander tendencies, which leads to him being being very enthusiastic about his weird ideas.
Blazion from Yo-kai Watch is a hot-blooded, fire themed yokai who possesses the power to make people extremely motivated.
In Gems of War, Sapphira, the local quest-giver, is rather impulsive and reckless; after she was attacked by religious warriors, her response was to immediately attack the nearest town and burn down its temple, ignoring both short-term outnumbered-ness and long-term consequences. (As her card's text says: "Not all vampires are evil, some are just crazy.")