The yellow Mr. Game & Watch/Mii Brawler's costume represents the Creeper, a Minecraft enemy with a green color scheme who often appears in groups.
The Bomber item references the Creeper's ability to explode, which will inflict massive damage to the player and damage the structures in Minecraft.
The Bomber item also reference the Creeper's ability to self-destruct, where they will stop in place, flash, and then explode.
Other trivia:
This spirit's Attack type and Fire Attack ↑ ability reference the Creeper's ability to attack by exploding.
