Monosame is the ruthless shark captain of the ship that Atsushi and the others wake up on. He speaks as if he's the captain of a pirate ship, and makes as many puns about the ocean as he can. He has a gruff voice in the medium-low to low range, barking commands or making strange jokes. He's no-nonsense, unless he's the one being nonsensical, wanting the students to focus solely on the killing game. He isn't very upfront about the circumstances surrounding the killing game however, typically trying to change the subject.