Alucard vs. Monkey D. Luffy
Alucard. How is this even in here?
Also, if Ichi's video is anything to go by, Alucard stole Nrvnqsr Chaos' moveset. Luffy is useless.
Aoshi Shinamori vs. General Olivier Armstrong
A much better opener. Probably boils down to speed really, the Rurouni Kenshin universe being some mythical place where all swordsmen operate at mach one at all times. There's also that Aoshi frequently holds his own against comparable swordsmen, even when the plot demands he lose, whereas Olivier is only ever crushing people so far beneath her it requires minimal effort, or being taken by surprise by Sloth.
Aoshi Shinamori.
Now then, my turn.
Zolf J. Kimblee vs. Kira Yoshikage
Spontaneous combustion round; Kimblee's typical brand of alchemy turns people into living time bombs, and anything Kira Yoshikage's stand Killer Queen touches also becomes a bomb. Kimblee's transmutation is bound by par for the course rules of alchemy, but he has range, whereas there's there's no practical limit to what Kira can turn into a bomb, but he has to be able to physically touch it, and can only have one bomb at a time (i.e. Kira touches a vending machine, it's now a bomb; if he touches a drinking fountain, now the fountain is a bomb, the vending machine is not).
Hardcore mode is Kimblee has a philosopher's stone and Kira has Stray Cat, meaning Kimblee ignores equivalent exchange and magnifies his attack power, but Kira Yoshikage can now attack from a distance with invisible bombs.
HEAVEN OR HELL
LET'S ROCK