Dark Eye is Spade's sidekick, proving to be rather emotional and strongly caring for Spade as he attends him when he is even in the slightest of discomfort. Dark Eye is revealed to be a female character named Ai, the green of the Shuffle Sisters, in episode 19 'Crash!! The Idol Stage!'. Ai balances her life, though a bit chaotically, between being a Shuffle Sister and Spade's loyal partner.