Wave Burner

From MMKB

The Wave Burner is Burner Man's main weapon. It's a short-ranged flamethrower. When used by Bass, the flame is green.

It's Pirate Man weakness, and it can break ice blocks and blow up boxes with fire drawn on them. When used in water, it turns into one "wave maker", pushing some objects and enemies, like the floating spikes in Pirate Man's stage. It can also give some light to dark places.