A part-timer at Sowon Piercing Shop. A Japanese man. Refers to himself in the third person (e.g., "Riku thinks...", "Riku is..."). Has one or two piercings in his ears. Has a rather tan complexion. Has fox-like features. Insanely popular; the owner is very pleased and takes good care of Riku because everyone comes to get pierced just to see him. Not particularly interested in women... Has two older sisters.