Boomer

From Paper Mario Wiki

Boomer is the third pixl that Mario gets. He is a bomb. Mario meets him in Chapter 2, Gloam Valley.

[edit] Using Him

Players press "1" on the Wii Remote to turn him into a bomb and set him down. They press "1" again to detonate him. If this is not done, he will eventually detonate on his own. When hit with fire, he detonates right away. He is used to attack enemies, break blocks, and destroy cracks in the wall. Before Mario gets Cudge or Bowser, he is Mario's only defense against enemies with spikes.

Pixl
Tippi | Thoreau | Boomer | Slim | Thudley | Carrie | Fleep | Cudge | Dottie | Barry | Dashell | Piccolo | Tiptron