Petey Piranha

Petey Piranha is a recurring boss character in the long  series. He was confirmed to appear as a mini-boss in Super Smash Flash 2's regular Adventure mode.

In Super Smash Flash 2
According to the fourth Smash Flash DOJO!!!, Petey was planned to appear in Adventure's as one of the stage's mini-bosses. His sprites were a recolor of his sprites in Super Princess Peach. Including his attack patterns, nothing else was revealed about Petey, however.