Prince Arin is the son of King Nogburt. He met Teddy and Gimmick in the Mudblup dungeon. He met Grubby when the three of them rescued him from the Mudblups. He told them of his lost sister, Princess Aruzia who had been kidnapped. They helped him get her back and they've been welcome at the castle ever since. The castle later became of greater importance when Arin finds the Crystal Book in a small opening under the castle. It's also where the life of the King is saved. Arin also helps get Grubby and Gimmick out of M.A.V.O. (The Monsters and Villans Organization).