Oslo Suwen (オスロー・スーウェン) is the representative of the Suwen Trading Company and Otto's older brother.
Like his two brothers, Oslo looks a lot like his mother and has gray hair.
As the representative of the Suwen Trading Company, Oslo possesses a toughness which suits well for his stature. He often worries about Otto, but has confidence his brother will be able to figure things out for himself, showcasing a willingness to place his faith in his family. Even though he’s young, he’s a fearless sort that wears a beard well.