Rollodillo

Rollodillo is an armadillo-like boss in Super Mario Galaxy 2. It is fought in the Boulder Bowl Galaxy in the mission Rock and Rollodillo.

Appearance
Rollodillo is a large beast with a reptilian-like face and mammalian body which is covered in thick blue fur. He has a hide made of pieces of rock which covers the majority of his body minus his rear, face, and underbelly.

Strategy
He attacks mainly by rolling around the planetoid in a fashion similar to a boulder. Mario can only fight Rollodillo while Rock Mario. There are a total of two rounds. When Rollodillo gets dizzy and stops rolling, Mario will need to transform into a boulder and ram into its weak spot, its rear; a Spin Attack is rendered useless against this boss. Mario will need to hit Rollodillo's rear four times. After this, the boss will explode and grant Mario the Power Star.

Trivia

 * "Rollodillo" is a portmanteau of roll and armadillo.
 * Rollodillo shares his boss theme with Sorbetti, Prince Pikante, and Peewee Piranha.