History YMMV / Oni

* PortingDisaster: The UsefulNotes/PlayStation2 version has some awkward controls and certain sections will drop frames to almost unplayable levels and a good chunk of these sections are large open areas with tons of enemies where it's incredibly hard to survive, this only gets worse and worse as the game goes on as it seems the later levels received little-to-no optimization for UsefulNotes/PlayStation2 Hardware.

* MagnificentBastard: Muro, believe it or not. Think about it. He wiped out the OmniscientCouncilOfVagueness leading the Syndicate and became its sole leader (so the manual says). He had Chung the mole killed off and planted information on his corpse to lead Konoko in the wrong direction. Even when she figured it out and went in the right direction, he took off. He even managed to escape via the airport, even with her pursuing him. He had the Syndicate tear through TCTF headquarters just to snatch Shinatama. Even when Konoko eventually found out his plan, she could only disrupt it rather than stop him. [[spoiler: That would be his plan to make the Atmospheric processors release poison instead of clean air, all so that he could give a Daodan Chrysalis to anyone who would swear loyalty to him]].

* PortingDisaster: The PS2 version has some awkward controls and certain sections will drop frames to almost unplayable levels and a good chunk of these sections are large open areas with tons of enemies where it's incredibly hard to survive, this only gets worse and worse as the game goes on as it seems the later levels received little-to-no optimization for PS2 Hardware.

* DarthWiki/MostAnnoyingSound: The Hughes Black Adder SMG, and the fact that over 60% of your enemies carry it certainly doesn't help.

* MostAnnoyingSound: The Hughes Black Adder SMG, and the fact that over 60% of your enemies carry it certainly doesn't help.

* EarWorm: The game's music is just full of these. Listen to [[https://www.youtube.com/watch?v=B-YgjL6CTMU Ambient Suite]], [[https://www.youtube.com/watch?v=7ksRpoCdvb0&feature=related East Wind]], [[https://www.youtube.com/watch?v=_ApwFgcG1yc&feature=related Fight]], [[https://www.youtube.com/watch?v=mVk2YM9Hj9g&feature=related Trailer]], [[https://www.youtube.com/watch?v=0H9-Yi5HDrI&feature=related Internal Space]], [[https://www.youtube.com/watch?v=Rc5P6l12fLs&feature=related ONI Fever]].

* CompleteMonster: [[BigBad Muro Hasegawa]] is the leader of [[NebulousEvilOrganisation the Syndicate]], and [[PlayerCharacter Konoko]]'s [[CainAndAbel evil brother]]. Kidnapped by the Syndicate as a child to be used as a weapon, Muro killed and usurped enough people from within to become the Syndicate's new leader. Exploiting his father's wishes of evolution, Muro plans to leak the outside world's toxic fumes into the atmosphere, forcing anyone who wishes to survive his apocalypse to sell their loyalty to him for Chrysalis, all as a way to establish control over the world. Planting a brain-powered explosive that would have killed anybody within a 50-mile radius, he escapes to an airport, ordering his men to massacre everyone inside as a way to distract TCTF. He later orders a break-in at TCTD headquarters that results in the capture of Shinatama, who Muro tortures to near death for fun. Trying to kill her after she refuses to join him, Muro still succeeds in wiping out a majority of humanity even after his death.

* GoddamnBats: Anyone with a machine pistol. It does low damage with a large spread and a high rate of fire, so you can't dodge it and don't want to use it either.