Babylon

The Warp Blighted, whose joints are unnaturally flexible, allowing him to fit through even the smallest of spaces, like a rodent, earning him the name "Babylon the Giant Rat." A master of martial arts that utilizes his body's flexibility, he is recognizable by his small eyes that conceal his emotions. During combat he will laugh in a way that antagonizes his enemies. Though he seems aloof, much like the rest of the guild, he cares greatly for his companions, and is known for keeping a cool head, as well being a reliable decision maker.

(Source: I Was Reincarnated as the 7th Prince so I Can Take My Time Perfecting My Magical Ability Official Site)