Thwomp

Thwomps are large blue blocks with faces that appear in the Super Mario Bros. series. They attack by attempting to crush the player. They cannot usually be defeated, but can be jumped on top of in some games.

Dosun
Found in the files of Super Mario 64 is an earlier version of the Thwomp called Dosun.

Marty The Thwomp
Main Article: Marty The Thwomp

Marty the Thwomp is a green Thwomp documented to appear in Mario Kart 64 as a background character, and possibly as a playable driver.