As I posted before on gamers thread my character is El Fuerte. I mostly play online, and arcade mode annoys me a lot. When I come with contact with players that use Sagat he is pretty easy.
The thing is that El Fuerte has very quick attacks that can come from above or below so I can confuse the fuck out of people whether to block in crouching position or in standing position. This technique is pretty effective on characters like Ryu, Ken and Sagat. Gamers often pick Abel, he is strong and frustrating as hell. Blanka is fucking impossible once people know how to play him and I get so fucking angry playing with him I punch myself in the face. Chun-Li is also very hard.