I agree with the sentiment that there is no weakest member. The point of RPG-style fighting is that your team members work together and support each other's weaknesses. Mallow's got pretty bad attack power, but his magic is strong and he can heal. Geno's defenses may be bad, but that's why there's healers, and his attack and magic make up for it. Anybody who calls Toadstool weak needs a good slap upside the head (although she's pretty weak when you first get her), and her healing abilities are almost too good. Actually, if I had to choose a weak member, I'd say Mario. He's well-rounded enough to have almost no real strengths, he's lucky to have such cool friends, I guess.
"Like the moon over
the day, my genius and brawn
are lost on these fools."
-Bowser, SMRPG
Sometimes I dream about being carried off by a giant squirrel...Does that make me a nut?