I will acknowledge that Petey Piranha is in Brawl's Adventure Mode. I will not assume, however, that he will be included as a playable character; I dread the thought.
I hate the character, and I am unafraid to let the world know. I think that he is an oversized weed that makes gargling noises and spews sludge. He lacks any semblance of personality. Petey is a vomiting plant in a polka-dot diaper. How appealing.
And yet Nintendo has some inexplicable infatuation with this monstrosity! Petey has been employed more and more frequently for some bizarre reason, taking roles as a boss AND as a spin-off character. Seeing him in Mario Power Tennis and Mario Strikers Charged made me want to emulate my most-hated character and vomit all over the screen. Granted, both are fine games, but I cannot stand to see such an uninteresting and unappealing character included in nearly every Mario outing, let alone have any sort of fanbase.
If he remains an NPC, I will be satisfied. I would just hate to see such a waste of space take up a valuable spot on the roster when it could just as easily go to a far more deserving character, be it just about anyone else from the Marioverse, or even a cool retro character (Skapon? Little Mac? Takamaru? Mike Jones?). Petey as a playable character FTL. Bigtime.
EDIT: It's "Palutena" from Kid Icarus. Spelling ahoy.
Also, I'm not bashing Petey fans; I'm sure that you're all very nice people, each one entitled to your own opinion(s). I just wanted to express my (strong) feelings on the matter.