Sampo Koski is a merman with short blue hair, styled a little casually to the right. He has bright green eyes and a perpetual playful smile on his lips. Instead of legs, he has a dark blue fish tail, sparkling with blue scales. A merchant who acts like he is everyone's friend, is enthusiastically humorous, and is good at bantering. He is an eloquent mercenary who does all sorts of jobs for his "customers," as long as he doesn't get paid off with a higher price.