Oscar is a neurotic fish and the brother of Milo. He is known to have a huge, almost obsessive crush on Bea; his locker is decorated with a shrine to her, and he often accidently mentions his love for Bea.
Oscar can be seen playing video games often. He seems to be much of a technology "nerd." He is a friendly fish that could be friends with anyone. He tends to be the "Worry-wart" of the trio, and is usually the ignored voice of reason. When he is alone with Milo, he seems to be his calmest opposed to when he is with Bea or Clamantha and he is the most hyper. He seems to be into roleplay and strategy games and has taken up crocheting due to Bea and her friends teaching him. His dream is for Bea to like him back.