Sumo Bro

Sumo Bros. are a sub-species of Hammer Bros. in Super Mario World. They stand on blocks and make fire appear below them to attack Mario.

It's not exactly known how they perform the trick put when they pound their feet a lighting bolt falls down and creates a huge wall of fire.

They also appear in New Super Mario Bros., where they fling hammers, and also have a move where they pound the ground, destroying weak blocks and stunning Mario if he is on the ground.

Appearances in Other Media
A single Sumo Bro., though called a Fire Sumo, appeared in the Super Mario World episode "Mama Luigi". This Fire Sumo appears to attack Luigi as he is exploring the abandoned Dome City; this Fire Sumo ends up stomping the ground beneath Luigi hard enough to cause it to crack, sending Luigi plummeting downward.