MARIO:
Who doesn't Know The Italian Plumber?
He is the protagonist of this Excellent RPG
His multiple kinds of Jumps Wipe out almost evey enemie!!!
his atributes are leveled  at the start of the game
but at the end he lacks defense
MALLOW:
The party's Crybaby. He cries when he doesn't get what he wants, in fact he is not weak his magic attack and defense kicks ass, but his attack and defense are awfully low
GENO:
the doll from the skys, he is very strong, but he lacks defense, his magic attack "geno whirl" if timed right can cause 9999 damage!!!!!
he's the most powerfull member of the group.
PRINCESS TOADSTOOLL:
Girls dont fight........Right? I don't Think so, in fact this litle girl is a fine warrior, the weakest of the group when you firts get her, but at the end of the game she's very tough.
Her healing attacks make her and indispensable member of the party. 
BOWSER:
Believe it or not, he is by mario's side this time!!
after being kicked out of his castle by smithy's gang, he meets mario and "letting him and his party join the koopa troop" he becames a member of the party, his attack is awesome, but his magic is not very good.