Hammer Bro

Hammer Bros. are a species of hammer-throwing Koopas from the Mario franchise, in which they first appeared in Super Mario Bros.. Hammer Bros. only appear in one Sega game, Mario & Sonic at the Olympic Games Tokyo 2020. Hammer Bros. also appear throughout the Super Smash Bros. series, with Super Smash Bros. Brawl being their first crossover appearance with a Sega-owned franchise, Sonic the Hedgehog in particular, and the first title within the series Assist Trophy.

Mario & Sonic at the Olympic Games Tokyo 2020
In Mario & Sonic at the Olympic Games Tokyo 2020, Hammer Bros. only appear in two 2D Events, Volleyball and Marathon, and the Tokyo 1964 minigame Museum Sneak. Like several other Mario characters and species in the Tokyo '64 game system, Hammer Bros. reuse their sprites from Super Mario Bros..

Unlike their other appearances, Hammer Bros. neither use hammers nor have any association with them. In Museum Sneak, some time after Mario starts a stage, a Hammer Bro with a flashlight enters the area. It moves around faster than the other enemies. In Volleyball, five Hammer Bros. act as Bowser's teammates. In Marathon, several Hammer Bros. are among the 68 participants, and they move at a similar fast speed as the Hammer Bro in Museum Sneak. Aside from this, Hammer Bros. do not run around fast in any of their other appearances.