Against which character do you really like to fight?

Maybe the question sounds sarcastic, but seriously xD There's a character that when you find it you say "Oh maaaaan, this is gonna be good"?

In my case that character is Zato. I know it's a hard character, so if someone is using him in rank tower I know it's because that player is main Zato. And I really enjoy trying my best to escape of Eddie's pression.