The Ultimate Mushroom's main shape is that of a shortened Heartless emblem. The top of the heart displays a large, wing-like crest and an opening just above it shaped like another, smaller heart. The two side tips of the fleur-de-lis have thin, twisted protrusions on them. The edges of the crest and edges of the shield are silver. The shield's face is adorned by the head of one of the Mushroom XIII, with a black head, "hood", and arms with pitch-black, angular spirals on the hood, a pitch-black head, and yellow, seemingly glowing eyes. The shield's face behind the head is light grey with several dark grey lines radiating out from behind the Heartless's head. Just below this head is a black circle with a white Roman numeral 13 (XIII) on it. Two other Mushroom XIII members are hanging on to either side of the shield with one hand. Their silver zippers are visible and the Heartless emblems on their chests are completely red silhouettes, lacking any of the black colors in the actual symbol.
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