Kai Yuki is a tall and slim 18-year-old with a light complexion and clean-shaven facial features. His shaggy brown hair is styled simply, giving him a relaxed yet cool appearance. He wears a bright red hoodie that contrasts against his dark jeans, paired with sleek black sneakers featuring red soles. Kai's design utilizes clean, minimal linework with flat colors, embodying a modern cartoon style. His proportions are stylized, with simplified shapes for his clothing and minimal detail in his hair, creating an iconic, approachable look.