Sampo Koski is a charming, eloquent mercenary from Belobog's Underworld who does all sorts of jobs for his "customers," as long as he doesn't get paid off with a higher price. He is a silver-tongued merchant who freely travels between the Overworld and the Underworld. He acts like he is everyone's friend, is enthusiastically humorous, and is good at bantering. The information that only Sampo possesses makes it hard not to approach him for help. Slippery, egotistical, but with a soft spot.