Minotaur is an evil music manager who enslaves great singers and makes them to do his bidding. On one occasion, he kidnapped the Sirens in order to force them to make a hit single. Luckily, Val Hallen arrived to stop him. However, Minotaur didn't fight him, and instead surrendered peacefully and requested Val's autograph, revealing that he is his biggest fan.
His name is a reference to the mythical Greek creature of the same name.