Fujishiro Shark  

, シャーク藤代

Shark is an artificial intelligence assistant that was initially summoned by Suns father during the Michishio family's initial visit to the Seto family home with the intention of attacking Nagasumi. In human form, he later became Nagasumis P.E. teacher. He believes that the quickest way to resolve problems is through violence and often tries to eat people, including Nagasumi. According to him, his logic is sound, but it has resulted in him being seen as a threat by many. Shark can transform into only a sharkhead or a whole shark, depending on the situation.