Boss Sumo Bro.
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Boss Sumo Bro. (also simply known as Sumo Bro.) is an enlarged Sumo Bro. who appears in New Super Mario Bros. U and New Super Luigi U. He is one of the game's mid-bosses along with Boom Boom and Kamek.
 New Super Mario Bros. U
In New Super Mario Bros. U, Boss Sumo Bro. awaits in his tower after the defeat of Boom Boom. Boss Sumo Bro. was a regular Sumo Bro. until Kamek transforms him, somewhat changing his appearance and greatly increasing his size.
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 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 because of 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. Interestingly, he is simply referred to as Sumo Bro. in the game.
Boss Sumo Bro. 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, and he is larger than the average Sumo Bro..