Il Piantissimo

Il Piantissimo is a man disguised as a Pianta that the player must race in Super Mario Sunshine. He's very fast. He plays a role similar to that of Koopa The Quick, who appears in Super Mario 64.

Stages Where You Race Him
Gelato Beach

Noki Bay

Pianta Village

Other
If you beat the game without all the Shine Sprites, the ending screen will show Il Piantissimo looking at the paint brush Bowser Jr. used.