Block Mario

Block Mario (ブロック マリオ, Burokku Mario) is an original form that only appears in chapter 10 of Super Mario-kun volume 1.

Chased by a homing flying hammer, Mario runs on top a tower of ! Blocks, hoping of having escaped it, but the hammer still follows him and pounds him inside of the top block, then destroys the tower and Mario, still stuck in the block, falls on the ground. Mario is laughed at by Luigi and Yoshi and, angry at them, pops his arms and legs out from the block and punches them both.

Mario comes with a plan: using his new block-armor, Mario can jump at the Amazing Flyin' Hammer Brother they've been fighting until now, hole up in the block when hammers start raining, and then reaching him and defeating him. Unable to use his cape, still inside the block, Mario uses a trampoline and puts his plan into action, but the hammers overpower Mario's block and he falls to the ground, hurt by the hammers and with the block armor destroyed.

Trivia

 * Block Mario's form maybe inspired the Super Mario 3D Land and Super Mario 3D World 's Coin Box and New Super Mario Bros. 2 's Gold Block, other blocks that Mario can wear but aren't useful against enemies.