A bizarre beast with a human face that looks like it's wearing a 70cm black penguin costume and hood. After being fed a mysterious mushroom, its eyes turned white and purple mushrooms began sprouting from its body. Normally it only cries out "Gugugaga," but it has started speaking human language. While it usually craves sweets, it has developed a taste for water and wood shavings. It prefers damp, poorly lit places, though it occasionally sunbathes. Originally a selfish, volatile, and insolent creature, it has become quiet and mild-mannered. It constantly sways its body irregularly; it appears as though the Gugugaga's own will has vanished and the mushroom is now puppeteering its body. If all the mushrooms are pulled out, the Gugugaga itself will cease all activity.