Professor Yango, brother to Boss Gyan, resides on remote Peropero Island guarding the genuine Moyamoya statue, the department store display being a decoy. He relentlessly pursues the artifact for his own objectives, including those tied to Princess Zara and her stolen soul. This pursuit brings him into direct conflict with Ultra-kun and his companions during their mission to retrieve the statue. His actions on Peropero Island culminate in confrontations with the protagonists.