Gen is a slim, pale-skinned man of average height with bicolored hair—short and black on the left side, white with longer strands on the right. His dark, shadowed eyes have a cunning slant, and his stubby eyebrows lack a tail. He bears a petrification scar, a jagged mark resembling a mouth-like wedge from his left eye down his cheekbone. Notably, he prefers to walk barefoot, without proper footwear.