If it is Super Smash Bros Brawl that you are talking about, which I assume that you are, you can pass through the hidden doors in the Ruins, the Forest and the Swamp to unlock more characters.
You play through the Story and kill the boss of the last mission (Tabuu.)
You can't.You can only beat him as a boss twice.After that you can fight him again after you beat Tabuu in Boss Battles.
Tabuu isn't a playable character. But you can get his trophy
You can't play as Tabuu, you can only fight him.
Tabuu is the final boss from Super Smash Bros. Brawl on Wii.
Tabuu is unplayable unless you cheat.
You Cant
Tabuu.
No he is not a playable character.
You can't get him.
Tabuu.
you can't he's not playable