Blockstepper

Blocksteppers are enemies first appearing in Super Mario 3D World. They are red blocks with feet and cornet-like mouths. They also wear brown soldier hats.

Blocksteppers appear in various levels, always marching in groups of two or more. They can be defeated by a single jump, scratch, tail whip, fireball, or other projectiles. However, defeating one from the group will make the others romp around frantically, and after some time, they will begin to angrily chase after the player.

Trivia

 * Blocksteppers make a very similar sound to a Pikmin when they are undisturbed.
 * Their name is a combination of "block", which they resemble, and "lockstep", referring to their synchronized marching formation.