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The unnamed fish is a minor character who first appeared in SMG4: Luigi's Lesson.
In his debut episode, he is a background character as one of the many people who are frightened of Saiko Bichitaru due to her psychotic tendencies.
He appeared as one of Mario's potential customers but got scared off by Mario's antics.
In this episode, he is seen working at the Bestfield Shopping Mall to unlock the mall doors. Once he does that, everyone outside started rushing inside to get a copy of Super Smash each other in the ass bros Ultimate, trampling on the unnamed fish in a hurry.
In this episode, he first appears as one of Bob's fans. As he was walking past Mario, the latter took his balloon which caused him to float up and collide with a plane (Much to Toad's chagrin, he survived). Later in the episode, after Saiko Bichitaru released Darkest Hour, he was among Bob's fans that switched to her. He went as far as to throw away Bob merchandise he owned despite knowingly being seen of Bob. He is last seen leaving with the other fans to avoid hearing Bob rap.
He appears as a roadside vendor selling ropes. The moment Mario snatched a rope from him, he said: "I am lonely."
He appears in a flashback as one of the ill-fated passengers who would die in the plane crash because Mario threw the pilot out.