No but he is an assist trophy.
Shadow is not a character in Super Smash Bros Brawl, unfortunately.
No, in fact Shadow isn't even in Super Smash Bros. Brawl. He is from the Sonic games. Sonic however, isn't from Super Smash Bros. Brawl but Sonic is in Super Smash Bros. Brawl.
You cannot become shadow in Super Smash Bros. Brawl.
No
NO
No.
Shadow is onlyAccessibleas a Smash Trophy.
Shadow in not a playable character in Super Smash Bros Brawl; he is only an assist trophy.
He is not a playable character.
No Shadow is not a playable character.
Nope
You can't.