Depending on how you unlock them, possibly.
There is not playable character called Jet in Super Smash Bros Brawl.
Not a character.
krystal is not a playable character in brawl
toad is not feature in Super Smash Bros! in fact! Peach is shield with toad!
he is not a character in this game
As a playable character, no.
If you're thinking of the Sonic Riders character, you cannot unlock him in Brawl.
Dr mario is not an unlockable character in brawl.
He is not a playable character. you can only unlock a trophey of him
Toad is not a playable character.
No. He's not a playable character.
No.