It really depends on the user of the character. any character can be the best but also the worst
Then ... it sucks to be you.
Master hand is not a playable character in brawl.
There is no such character.
No. Cloud does not appear in Brawl.
No, he is not. I have every character in Brawl and he/it is not one of them.
No. Only Pikachu is available in Brawl.
No. Tom Nook is not a playable character in Brawl.
What character?
Mewtwo is not a character in Brawl
Tabuu is not an unlockable character on Brawl.
The master is....... YOU, you battle the character you are playing as!
The brawl master is YOU! When you reach the end of the tournament, you battle the character you are playing as!