Minecraft wiki entry for Super_Smash_Bros._Ultimate, associated text: Creeper Mask + Outfit - a model replacement costume for the Mii Brawler. The Mii's limbs are replaced by floating creeper legs.
Pig Mask + Outfit - another model replacement costume for the Mii Brawler in a similar vein to the Creeper Mask + Outfit. The costume may be based on the famous pig model error.
Diamond Helmet + Armor - a suit costume for the Mii Swordfighter, giving it diamond armor and a diamond sword.