There is a patch called Street Fighter X Tekken 1.06 that one can download to unlock other characters. Run the setup program and install it and copy the file, const.lua under the StreetFighter boot game folder.
Pac-Man and Mega Man characters are available as free PlayStation 3-exclusive download. The DLC characters are available from the in-game menu's Store section, under "New Downloadable Content".
Unlocking seth is NOT a easy task,You have to complete all characters story mode
Unfortunatly no, to get new characters you have to purchase the other version of the game.
read the complete details here - http://j.gs/1010114/sf4-unlock-characters
no not for arcade mode
You can only unlock Cody in Super Street Fighter IV!
You can't unlock jinpachi in tekken 5. He's usable if you chance upon him picking random characters. He is unlockable in tekken 5 dark resurrection, though.
read the complete details here - http://j.gs/1010114/sf4-unlock-characters
Zero's a mega man character you can't unlock him in any street fighter game!
Beat the game with every character.
You cannot unlock Oni.
Beat the game with the original characters in order to unlock him.