History VideoGame / ResidentEvil0

** Billy Coen was originally just a character mentioned in a report by Rebecca from the Nintendo 64 version of Resident Evil 2 who was mentioned to have been killed and turned into a zombie. Here, he is Rebecca's main ally and is revealed to have been framed for a crime he didn't commit, leading to Rebecca helping him fake his death at the end of the game.
** James Marcus was first mentioned in a file exclusive to the Nintendo 64 version of Resident Evil 2.

* AscendedExtra: William Birkin finally gets some screentime in a non-monster form.

* RoaringRampageOfRevenge: The "mysterious youth"/[[spoiler: Dr. Marcus]], as he is sure to announce in every single line of dialogue. His rampage sets in motions the events of the rest of the series.

* ScrewTheRulesImDoingWhatsRight: [[spoiler:Rebecca refuses to arrest Billy, and by the time she manages to reunite with Enrico, she abandons her mission completely to save him. By the end of the game, she's faking his death.]]

** Flame grenades and Molotov cocktails are the best weapons to use against leech zombies; not only do they inflict the most damage, they cause them to die ''without'' exploding.
** Mimicries also are best dealt with using Molotov Cocktails and the Grenade Launcher's Flame Rounds.

''Zero'' became the last game of this franchise to utilize pre-set camera backgrounds and exploration-oriented game design; ''VideoGame/ResidentEvil4'' marked the series' [[ActionizedSequel shift towards action and shooting]].

* SwallowedWhole: The Lurker enemy has a swallow attack that will OneHitKill Rebecca or Billy if it lands it.

&& Flame grenades and Molotov cocktails are the best weapons to use against leech zombies; not only do they inflict the most damage, they cause them to die ''without'' exploding.

* PlotHole: Rebecca is bitten, scratched and even swarmed by leeches, but she never contracts the T-Virus. This is not even a case of GameplayAndStorySegregation as it happens during several cutscenes. To make matters worse, there is a file in the game implying that by simply touching a leech will get you infected immediately after. About the only explanation is that Rebecca is one of the 10% of people that's immune to it.

%%* SwallowedWhole: Lukers' OneHitKill.

* KillItWithFire: Flame grenades and Molotov cocktails are the best weapons to use against leech zombies; not only do they inflict the most damage, they cause them to die ''without'' exploding.

* AttackOfTheFiftyFootWhatever: Downplayed, but every single boss other than the Proto-Tyrant and [[spoiler:the Queen Leech]] consists of an ordinary animal grown to a gargantuan stature -- in order, a scorpion, a centipede, and a bat. A file in-game justifies this by explaining that a dramatic increase in stature was the most consistent mutation produced by the Progenitor Virus; more drastic mutation potential was why it was superseded by the T-Virus. It also doubles as a MythologyGag; The original ''Resident Evil'' consisted mostly of giant animals for bosses until the remake of the first game added the Crimson Head Alpha and Lisa Trevor.

* UnexpectedlyRealisticGameplay: A lot of cases, really. The inexplicably-linked item boxes of old are gone, forcing you to trade items with your partner or drop them on the ground where they can be picked up again, unlike any other Resident Evil game that treats drops as permanent discards. Rebecca has the medicinal knowledge to combine herbs, while Billy doesn't which is a departure from the rest of the series allowing it with anyone, and despite her S.T.A.R.S. uniform vest, being a TeenGenius also means Rebecca is one of the lowest health characters in the ''franchise'', even compared to the likes of [[VideoGame/ResidentEvilOutbreak Yoko]].

* HeadCrushing: If a zombie latches onto the PlayerCharacter, they can be dispatched with a boot to the skull.

* EverythingsBetterWithMonkeys: Horribly subverted with the Eliminators, who are [[KillerGorilla psychotic albino lab chimps]].

** At one point, Billy and Rebecca have to get into the kitchen which is locked behind a special door. They never consider hopping over the open counter into the kitchen.

* InformingTheFourthWall: Some items have very specific uses. For example, early on there's a room where a character will get trapped in because there's something stuck in the keyhole, and the character mentions they need something sharp to poke it out. The knife doesn't work, and if it's Rebecca, neither does her mixing kit which is shown to include syringe needles. The only way to open the door is to find an ice pick and give it to the character.

* UnwinnableByMistake: The boss battle against Centurion is the only mandatory character fight in the game, as the giant centipede captures Rebecca and starts running around the room with her, leaving Billy to save her by killing it. If you don't give him sufficient firepower before Rebecca gets grabbed, you can run out of ammo and will be unable to do anything to hurt it, forcing a restart.

* ThoseTwoBadGuys: [[invoked]] [[MagnificentBastard Wesker]] and [[MadScientist Birkin]], who show up at several points in cutscenes watching the events on the security cameras and attempting to contain the situation.

* ActionGirl: Rebecca, sort of. She's certainly much braver and more capable then her [[DistressedDamsel earlier/later self]] from ''Resident Evil''. Easily justified considering that by ''Resident Evil'', she's been up for a couple days straight and is running on nothing but fear and adrenaline in the middle of a ZombieApocalypse. However, in ''[[VideoGame/ResidentEvilTheUmbrellaChronicles The Umbrella Chronicles]]'', we find out she has at the very least had a nap, albeit a nightmare-filled one.

* StylisticSuck: The acting in this game is rather odd. Considering it was released after ''VideoGame/ResidentEvil1'''s remake, which mind you has very good voice acting and script, one can assume the script and the acting is for this game is ''deliberate'' after fans missed the original lines that made the original ''Resident Evil'' famous.

* Developersoresight: In a viciously cruel take, if the player decides to backtrack to earlier areas before the final battle with Marcus (likely to scrounge for supplies), every area in the game is suddenly filled to the brim with zombies that weren't there before or already disposed of prior.

''Resident Evil Zero'', the fifth main game in the ''Franchise/ResidentEvil'' franchise, came out for the UsefulNotes/{{Nintendo GameCube}} in 2002. It serves as a prequel to the original ''VideoGame/{{Resident Evil|1}}''. Creator/{{Capcom}} initially slated this game for the UsefulNotes/{{Nintendo 64}} as a follow-up to that system's port of ''VideoGame/ResidentEvil2'', but scrapped the original version of ''Zero'' halfway through development when Creator/{{Nintendo}} unveiled their next console (the [=GameCube=]). Capcom made the decision to move ''Zero'' from a dying platform to the next generation instead; at the same time, Creator/ShinjiMikami's team began development of a remake of the first ''Resident Evil'' for the [=GameCube=]. The development of the two projects overlapped, which led to both games sharing many of the same assets (chiefly the character model for Rebecca Chambers). As a result, development on ''Zero'' finished only a few months after the release of the remake of the first game. For more than a decade, ''Zero'' was exclusive to Nintendo platforms, as its only port was on the original UsefulNotes/{{Wii}} in 2008. However, on May 25, 2015, Capcom announced the ''Resident Evil Zero HD Remaster'', and it was released for the UsefulNotes/{{PlayStation 4}}, UsefulNotes/XboxOne, UsefulNotes/{{PlayStation 3}}, UsefulNotes/{{Xbox 360}}, and PC on January 19, 2016. A UsefulNotes/NintendoSwitch version was released on May 21, 2019.

* TwentyThree: Billy was convicted of killing 23 people.

** Rebecca gets her cowgirl ensemble from Resident Evil 1, plus a new leather outfit, while Billy gets a fancy suit. Since the closet is located only on the Ecliptic Express, it becomes impossible to change outfits after reaching the Management Training Facility.

''Resident Evil Zero'', the fifth main game in the ''Franchise/ResidentEvil'' franchise, came out for the UsefulNotes/{{Nintendo GameCube}} in 2002. It serves as a prequel to the original ''VideoGame/{{Resident Evil|1}}''. Creator/{{Capcom}} initially slated this game for the UsefulNotes/{{Nintendo 64}} as a follow-up to that system's port of ''VideoGame/ResidentEvil2'', but scrapped the original version of ''Zero'' halfway through development when Creator/{{Nintendo}} unveiled their next console (the [=GameCube=]). Capcom made the decision to move ''Zero'' from a dying platform to the next generation instead; at the same time, Creator/ShinjiMikami's team began development of a remake of the first ''Resident Evil'', better known as the ''[=REmake=]'', for the [=GameCube=]. The development of the two projects overlapped, which led to both games sharing many of the same assets (chiefly the character model for Rebecca Chambers). As a result, development on ''Zero'' finished only a few months after the release of the ''[=REmake=]''. For more than a decade, ''Zero'' was exclusive to Nintendo platforms, as its only port was on the original UsefulNotes/{{Wii}} in 2008. However, on May 25, 2015, Capcom announced the ''Resident Evil Zero HD Remaster'', and it was released for the UsefulNotes/{{PlayStation 4}}, UsefulNotes/XboxOne, UsefulNotes/{{PlayStation 3}}, UsefulNotes/{{Xbox 360}}, and PC on January 19, 2016. A UsefulNotes/NintendoSwitch version was released on May 21, 2019.

** Rebecca gets her cowgirl ensemble from the ''[=REmake=]'', plus a new leather outfit, while Billy gets a fancy suit. Since the closet is located only on the Ecliptic Express, it becomes impossible to change outfits after reaching the Management Training Facility.

* AttackOfTheFiftyFootWhatever: Downplayed, but every single boss other than the Proto-Tyrant and [[spoiler:the Queen Leech]] consists of an ordinary animal grown to a gargantuan stature -- in order, a scorpion, a centipede, and a bat. A file in-game justifies this by explaining that a dramatic increase in stature was the most consistent mutation produced by the Progenitor Virus; more drastic mutation potential was why it was superseded by the T-Virus. It also doubles as a MythologyGag; The original ''Resident Evil'' consisted mostly of giant animals for bosses until the ''[=REmake=]'' added the Crimson Head Alpha and Lisa Trevor.

* GrapplingHookPistol: Reasonably subverted. The hookshot is quite large (taking two blocks of inventory space to have, similarly to large guns), it can only hold 80kg without getting damaged, and is slow.[[Note]]Both Rebecca and Billy weigh less than 80kg - Billy weighs 73, so the limit is basically FlavorText.[[/note]]