Quoted By:
Aqua, and it's not even a contest.
Boton & Selen are good at their chosen genre (FPS), but have issues when venturing outside of it. Same for Okayu (3D platformer). Fubuki has her favs (that indy rpg thing people cum over for some reason). Ans that's great, we all have favourites and specialities.
Aqua doesn't gove a shit, though. You give her a game, any game, she's going to excel at it.
She won't necessarily be amongst the top ranks in any given game (she isn't in Apex, despite desperately wanting to be), but she'll at least be competitive.
And then be the same in a completely different genre. Her 2D platforming is world class, as in, ahe gives the professional Twitch Mario players a run for their money.
There are chuubas who are better than Aqua at FPSes or RPGs, but Aqua can still hild her own. But there are none who match her 2D platforming, and none who match her versatilitity.
Her versatility is unusual even amongst pro gamers.