A young girl who wears a Kokuyo school uniform and shares the same 'pineapple' hairstyle as Mukuro. From what her parents talked about, she is a girl known as Nagi and lived a non-social life which made it hard for people to communicate with her. One day after rescuing a cat, she was badly injured in a car accident which lead her to lose her right eye and some of her organs. The only way to save her life would be to have someone with the same bloodtype to transfer their organs to her. She didn't care whether she lived or not and her parents refused the offer anyway. But after her meeting with Mukuro Rokudo, he allowed her to live by creating illusional organs. Despite having an introverted personality, she kisses Tsuna on the cheek during their first meeting and calls him "boss". Chrome is also trying hard to learn Italian, since her goal is to someday be able to converse with Mukuro in Italian. In the future arc Chrome is alone as she was hit by surprise with the ten year bazooka. She has been confronted by Gola Xina in an abandoned hideout that Mokuro used in the past and she apparently lived at. Her Vongola Ring appears to be frozen over. it looks similar to the ice Tsuna created when batteling the Blackspell.
Usually, Chrome is in control of her body, but if she is in an extremely dangerous situation, her body is surrounded by mist and Mukuro takes control, along with the body changing to Mukuro's appearance.
Chrome is chosen to be the holder of the Ring of Mist. She is overwhelmed during her battle against Marmon, but Mukuro defeats him when he takes control. Chrome has been shown using two of Mukuro's six skills.