Uni is the third Sky of the last generation of Arcobaleno, daughter of Aria, and the granddaughter of Luce. She was the Millefiore Famiglia's former second-in-command and is the current boss of the Giglio Nero Famiglia as a result of Aria's early death. Uni is a kind-hearted and polite girl, thanking people multiple times for helping her and always refers them with suffix "-san". Uni is also unselfish, willing to sacrifice her own life in the future to revive the dead Arcobaleno to restore balance to the Tri-ni-sette. She's also accepting and forgiving, harboring no ill will towards Byakuran despite everything his future self had done in the future.