- Resident EvilIntroducing
- Resident Evil 2Introducing
- Resident Evil 3: NemesisIntroducing
- Resident Evil Gun Survivor Introducing
- Resident Evil – Code: VeronicaIntroducing
- Resident Evil OutbreakIntroducing
- Resident Evil 4Introducing
- Resident Evil: The Umbrella ChroniclesIntroducing
- Resident Evil: DegenerationIntroducing
- Resident Evil 5Introducing
- Resident Evil: The Darkside ChroniclesIntroducing
- Resident Evil: RevelationsIntroducing
- Resident Evil: Operation Raccoon CityIntroducing
- Resident Evil 6Introducing
- Resident Evil: DamnationIntroducing
- Resident Evil: Revelations 2 Introducing
- Resident Evil 7: biohazard Introducing
- Resident Evil: The Marhawa Desire Introducing
- Resident Evil Heavenly Island
- Resident Evil: Vendetta Introducing
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Voiced by David Webster (2002) and Steve Von Wormer (2007)
- "Listen, little girl, if you haven't noticed there's some pretty freaked out things on this train. And I, for one, wanna' get out of here. I don't think we stand a chance of doing it alone."
- Chained by Fashion: He wears handcuffs throughout the game, dangling off of one wrist. He manages to pick them off by the end of the game, and he discards them by tossing them off of a cliff.
- Contrasting Sequel Main Character: He heavily contrasts the four (so far) canonical male protagonists in the games. Like Chris, he is a military man who fought for the right reasons, but whereas Chris will take reasonable orders, Billy refuses to kill anyone who isn't an enemy. Like Leon, he has a strong sense of justice and will help others. However Leon is a cop-turned secret agent, while Billy is a wrongly convicted man. While heavy with the snark factor, Jake is a mercenary Only in It for the Money who is a Jerk with a Heart of Gold, which initially gruff, Billy appears to be nicer than his appearance makes him. While Ethan contrasts all four men himself, Billy appears to know more than he should, while Ethan unknowingly gets himself into a situation where he has to fight to survive.
- Death Faked for You: By Rebecca, at the end of the game.
- Elites Are More Glamorous: Billy served in a Marine Force Reconnaissance unit.
- Hidden Depths: Despite how brutish he seems more often than not, he's remarkably good at playing the piano.
- Tip of the iceberg. When Rebecca finds him after he gets washed away, they come upon a pile of skeletons. Somehow Billy is aware that Marcus used them as test subjects for the Mother Virus. Someone knows a little more than they're letting on.
- Huge Guy, Tiny Girl: One of the brawniest male characters, partnered up with the smallest adult female character.
- Hunk: Absolutely.
- I Won't Say I'm Guilty: Granted, he's not.
- Jade-Colored Glasses: Billy is almost bizarrely aloof about his conviction, resigned to his fate, and cynically shoots down Rebecca when she tries to be optimistic about it. And yet...
- Knight in Sour Armor: ... The cynical, wrongfully convicted murderer has a powerful sense of justice. He's the one who convinces Rebecca to partner up with him and he's the one who refuses to go back on his word.
- The Nicknamer: To Rebecca.
- The Quiet One: Man of few words.
- Semper Fi: An ex-Marine.
- Tattooed Crook: Averted. He's the only convict among the series protagonists and has a very prominent tattoo, but Billy is a decent guy and not actually a criminal, and closer examination reveals that his tattoo reads, "Mother Love."
- What Happened to the Mouse?: Hasn't been seen or heard from since Zero. The only continuity nod is in Resident Evil 2, where Rebecca reported him dead.
- Where she misspells his surname as "Koen"...
Dr. James Marcus
Voiced by Ian Downie
One of Umbrella's three founding members along with Ozwell E. Spencer and Edward Ashford, the one who figured out how to make the Proginetor Virus into the T-Virus. He was murdered by Wesker and Birkin on Spencer's orders.
- Asshole Victim: See Corrupt Corporate Executive and Mad Scientist.
- Bishounen: His younger self was, apparently.
- Corrupt Corporate Executive: Though he was more concerned with R&D than Spencer or Ashford.
- Doomed by Canon: Since he's a Posthumous Character that's not seen in other Resident Evil games.
- Evil Old Folks: Like all the original founders of Umbrella (except Ashford).
- Evilutionary Biologist
- Mad Scientist: Like almost everyone involved with Umbrella. The medieval torture dungeons found in the training facility speak for themselves.
- Predecessor Villain: He created the T-Virus, making him responsible for, at the very least, everything up to Raccoon City's destruction.
- Wicked Cultured: A talented opera singer.
Mysterious Young Man/Reborn Dr. Marcus/The Queen Leech
Voiced by Ian Downie (old) and Lyon Smith (young)
A young man in strange clothes that causes the mutated leech outbreak on the Ecliptic Express. He claims to be Dr. Marcus reborn and wants to destroy Umbrella. He's actually Dr. Marcus' greatest creation the Queen Leech, which absorbed Dr. Marcus' body and memory.
- Achilles' Heel: His weakness to sunlight is what gives Rebecca and Billy the chance to survive.
- Back from the Dead: Thanks to some T-Virus infected leeches.
- Big Bad: Of Resident Evil 0.
- Bishounen: Presumably, the first time we see the Leech Queen it's impersonating the younger Dr. Marcus. Stops being the case after showing its hideous true form.
- Body Horror: The transformation from "younger Dr. Marcus" to "Queen Leech" isn't exactly pretty, to say the least.
- Dead Person Impersonation: What seems to be a younger Dr. Marcus is actually the Queen Leech impersonating him. The real Dr. Marcus is long dead, and absorbed by his own creation.
- Eviler Than Thou: First inverted, then Played Straight. When Spencer thought Dr. Marcus pretended to become The Starscream, he had Wesker and Birkin send a strike team to kill him and destroy his research. His Queen Leech survived, however, and its actions led to Umbrella's sudden downfall.
- Gone Horribly Right: He wanted to see the world burn after taking care of Umbrella. While dying put a stop to his plans, he did not need to do anything, as Umbrella's downfall happened because the world started burning.
- The Heavy: For RE0, overlapping with his status as Big Bad.
- Hive Mind: All leeches obey his commands, more often than not through an opera song.
- Humanoid Abomination: It's actually a grotesque T-Virus parasite taking human form.
- I Am Legion
- One-Winged Angel: His Leech Queen form.
- Predecessor Villain: Directly responsible for the Mansion incident due to the Leeches attacking Umbrella personnel, and indirectly to Raccoon City's destruction.
- Revenge: His motivation is revenge on Spencer, Birkin, Wesker, and Umbrella as a whole.
- The Undead: Naturally subverted. The real James Marcus is long dead, and the one that seems to be his younger self is actually the Leech Queen, having absorbed him after being left for dead.
- Voice of the Legion
- Weakened by the Light: In the dark, the Queen Leech is implacable. After being exposed to sunlight, it is neutralized in a single shot.
- Weaksauce Weakness: Sunlight.
- The Worm That Walks: Composed of thousands of leeches.
T- 001 "Proto Tyrant"
Umbrella's first semi-successful attempt at making a super soldier. Despite its primitive design in comparison to later B.O.W.s, it nonetheless demonstrated the "bare ferocity" that earned its series the name "Tyrant". During the experiment, the t-Virus' negative effects were found to be too potent, resulting in such deformities as the skin essentially "exfoliating". This led to the decision to discontinue the Tyrant's development.
- Attack Its Weak Point: Played Straight. Attacking its exposed heart or exposed spine deals massive damage to the creature.
- Awesome, but Impractical: Tyrants as a whole zigzag on this. They're extremely difficult to create, as only one in about ten million people have the genetic compatibility with the T-Virus to become Tyrants upon infection. However, they are extremely powerful creatures, and once Umbrella develops cloning technology, they really become a viable creature.
- Body Horror: It has a skull-like face with lip- and cheek-less jaws, a twisted claw for a hand, lesions all over its skin, a huge exposed heart beating on the outside of its chest, and its spine is exposed through its back. Although fans had long speculated that the heart had been forced out of the chest by the mutation process, it was eventually stated by Word of God that the heart was actually an external graft, and in fact it has three hearts to cope with the demands of its body.
- Flawed Prototype: It is the first model of tyrant developed and suffers several design flaws not seen in later models. While it has many of the benefits, such as increased musculature, a claw like arm, and the ability to regenerate severe battle damage, it also has more exposed weakpoints. Its grafted heart is more exposed to gunfire, and a flaw in its nervous system has left its spine exposed (creating an additional weakness) and causes it to twitch erratically.
- Flipping the Bird: Its middle finger on its right arm has mutated into the largest claw it has, making it appear to be constantly flipping you off.
- Healing Factor: A benefit of its genetic compatibility with the t-Virus. It can regenerate extensive battle damage very quickly. Often getting back up mere seconds after falling in combat.
- Mighty Glacier: It's slow and lumbering, but it's incredibly tough, as mentioned above. Although it is not as tough as its successors.
- Turned Against Their Masters: It attacks Wesker on an elevator in the factory.
- Unflinching Walk: Stalks menacingly towards the player, shrugging off shots all the while.
- Why Won't You Die?: Everytime you think you have put it down, it just gets right back up again to come after you (or attack someone else)
- Wolverine Claws: Its iconic mutated limb is a mass of sword-like clawed fingers.
- You Have Outlived Your Usefulness: Wesker states similar when the Proto-Tyrant attacks him. Amusingly stating "What do we have here? You were supposed to be disposed of."