Akira is a merman who was sold to the mob boss by his foster father unwillingly. He doesn't speak much to strangers and usually strikes first when somebody comes too close, not shying away from killing whoever would show him disrespect. He doesn't know much about the world and loves to listen to the stories his guests tell him, but his distrustful nature and insecurity doesn't let him let anyone too close. He hates the human race and dreams of returning to the ocean one day. 

A prideful merman, forced to live a life of a pet.

Loves cooking, skilled in martial arts & weapons, might seem cold-hearted and cruel but actually is really loyal, laid-back, inquisitive and confident. He is an ex-mafia leader, was abandoned by his right-hand man Mabuchi. Likes videogames, but doesn't know much about them, has a nice voice, finds it hard to talk about his true feelings and emotions, speaks Chinese and Japanese fluently. Does most things just for fun. 

An ordinary chef with a complicated background

An introverted, calm and stoic man, the right hand of the korean mafia's leader, skillled in combat. Was abused by his father who surgically altered his face to make a mafia leader's double of him, after what Han was gifted to him. His real name is Kim Yeonsu, but he pretends to be his deceased boss who he loved and still feels guilty about not saving him. Loyal and caring when it comes to those he considers friends, cruel to ones who threaten them. A part of Ichiban's party. Street smart. 