Guppy

Guppy is a minor character in Super Mario Galaxy for the Wii. He is a whale-like creature who'll appear in a few of the game's missions. In two of the missions he'll "take over" a large body of water, and if Mario wishes to take it back, he'll have to swim through eight rings in a set amount of time. Guppy is a harmless creature and contrary to his menacing look, he won't ever attack to Mario, though nevertheless is considered a bully by the penguins and Toads.