Unlocking seth is NOT a easy task,You have to complete all characters story mode
You can only unlock Cody in Super Street Fighter IV!
Zero's a mega man character you can't unlock him in any street fighter game!
Guile and Seth
You cannot unlock Oni.
yes- you have to unlock him
You cant
Complete all campains of all characters apart from gouken, Akuma, and seth. as you complete all of those characters it unlocks Seth for you to play with. simple as that Thanks.
Fighting often with a character will unlock all the colors, eventually.
Either 'cause you didn't unlock her or you got the ORIGINAL Street Fighter 4. Other than that, she should be there.
read the complete details here - http://j.gs/1010114/sf4-unlock-characters
There is no way to unlock the arcade version of Akuma.
Punch, kick, and shoot him with anything until he's dead, JUST LIKE EVERYONE ELSE.