Chrome Dokuro is a 13-year-old girl who was first introduced as Tsuna’s mysterious Mist Guardian and one of Mukuro’s subordinates.
Chrome is a talented illusionist and fighter, something that Mukuro has pointed out, stating that she has a quality to become independent soldier. Even though at first she’s mostly assisted by Mukuro, her own illusions gradually improves to the point only an expert can see through it, as stated by Mammon. This further proven when she’s able to create illusionary organs with her own power and supported Mukuro’s illusions that even Mukuro commented to be stronger from Flan.
The Japanese roumaji of her name, Kuroumu Dokuro, is an anagram of Mukuro Rokudo.
From what her parents talked about, she was once known as Nagi, and lived an isolated and non-social life. After trying to rescue a cat, she was badly injured in a car accident, which led to the loss of her right eye and some of her internal organs. The only way to save her life would be to have someone with the same blood type transfer their organs to her. She did not care whether she lived or not, and her mother refused to sacrifice her own organs anyway. However, Mukuro Rokudo heard her words and allowed her to live by creating illusionary organs.