Melphis is one of the three rivals encountered by the player in the Tayka region, alongside Belzer and Modeya. An irritable, rude, and violent character, his destiny is intertwined with the player, falling to evil if on one route, yet being redeemed and becoming the Champion in the other route. He is the only Trainer to have the Trainer Class of Rogue (at least in the main series) and Evil's Vessel.