Boss Sumo Bro

Boss Sumo Bro is an enlarged Sumo Bro who appears in New Super Mario Bros. U and New Super Luigi U. He is fought in the Rock-Candy Mines and he is one of the game's mid-bosses along with Boom Boom and Magikoopa. He appears to wear two around his shoulders, the ceremonial rope typically worn by yokozuna sumo wrestlers around their waists.

New Super Mario Bros. U/New Super Mario Bros. U Deluxe
In New Super Mario Bros. U, the Boss Sumo Bro awaits in his tower located in Rock-Candy Mines after the defeat of Boom Boom. Boss Sumo Bro was a regular Sumo Bro until Magikoopa transforms him, somewhat changing his appearance and greatly increasing his size. He is battled in Screwtop Tower.

In battle, Boss Sumo Bro jumps between the platforms in the room, stomping them to make electric waves below him in attempt to damage the player. Stomping the ground makes it shake for a few seconds, which may stun the player. Sometimes, he stomps the floor twice.

To defeat him, the player has to jump and hit the bottom of the platform where Boss Sumo Bro stands, causing him to fall on the back of his shell. While Boss Sumo Bro is stunned, the player must jump on him. He or she must to do this three times to defeat him. The Note Blocks in the room are quite useful for this because it is impossible to stomp on his head due to the spike.

New Super Luigi U
Boss Sumo Bro reappears in New Super Luigi U, having the same role from the original game. He is found in his new tower named after him, Sumo Bro's Spinning Tower.

Mario Golf: World Tour
In Mario Golf: World Tour, a Boss Sumo Bro costume is available for Miis to wear, and they can also use a ball and set of golf clubs designed based on a Boss Sumo Bro.

Paper Mario: The Origami King
Boss Sumo Bro, alongside his underlings makes his Paper Mario debut in Paper Mario: The Origami King, having been folded into origami by King Olly.

Appearance
The boss has the same appearance to that of a regular Sumo Bro, except that he wears two towels on his shoulders, his eyes appeared to be dash-like and slanted, he has a ring around his spike, and he is larger than the average Sumo Bro.

Trivia

 * Boss Sumo Bro is the only boss that does not normally appear on top of the Tower in the world map. He does, however, briefly appear on top of the tower after his defeat from the player or if the player is defeated and returns to the world map.