Blimp Yoshi

Blimp Yoshi is one of Yoshi's various power-ups in Super Mario Galaxy 2. Yoshi becomes Blimp Yoshi whenever he eats a Blimp Fruit. When that happens, he'll turn light blue, and expand like a balloon.

In this state, Yoshi can fly upwards for a brief period of time. On a side note, this power-up's properties are similar to that of Bee Mario, and the P-Balloon.