Aizetsu has deep sapphire eyes and often wore a dejected expression, even when he isn't sad. Sekido is uptight, has deep ruby eyes, and is known for his irritable expression. Karaku is a flirt who possesses deep emerald eyes, and often wears a gleeful expression. Urogi is outgoing, has gold-colored eyes, and an overjoyed expression at all times. Being quadruplets, all boys share a tall, lean, muscular build, tanned skin, along with jet-black shoulder-length hair.