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Yuni is the daughter of Aria and granddaughter of Luce. She is a young girl who is the Millefiore Famiglia's former Second-in-Command and the former Leader of the Giglio Nero Famiglia as a result of the early death of her mother, whom she did not know was a Mafia Boss. She inherited the Orange Arcobaleno Pacifier from her mother, and this Pacifier has been passed down in their Family for three generations. When Aria passed away, Yuni learns of the Mafia, and the leadership role she must play for the Giglio Nero Famiglia. Yuni was originally kind-hearted and caring towards others, and during that time, she came to know Reborn, whom she knows as her Uncle. The Giglio Nero Famiglia was losing strength and power. In order to keep the Family's power, she meets Byakuran, who schedules a meeting with her. After the meeting, Yuni emerges from Byakuran's office with a completely different attitude and personality (according to Shoichi, her heart was dulled with a powerful drug). She then announces that the two Families will merge and become the Millefiore Family, in which Byakuran would be the head. As a result of the merge, she has become bitter and cold-hearted. She was the head of the Black Spell and Captain of the 1st Calendula Squad. After the first round of Choice, she had recovered from the drug and intervened to say that the promise that Shoichi said that they made is valid, and Byakuran should honor it. When Byakuran ignored her suggestion, she decided to leave the Millefiore Family and asked Tsuna to protect her. She is the Sky Arcobaleno and Sky Arcobalenos are known for their short lifespans.
In the Future, she ranks as Millefiore's overall Second-in-Command and the leader of the Black Spell Division.Choice battle in which Vongola team lost, Shoichi demands a rematch based on the fact that Shoichi won the last game of Choice that he played in university after which Byakuran said that Shoichi was allowed to make any condition in their next match. Byakuran refused, claiming not to remember the conversation. Yuni then shows up claiming that as co-head of the Millefiore Family, she should have a vote in the matter. She reveals that she is no longer under the influence of the drugs that Byakuran had given and that she had protected her heart "by going to a faraway place". When Byakuran refuses her request she breaks of the pact between the Giglio Nero and the Gesso Families. She then asks Tsuna to protect her while showing him that she has taken back the Arcobaleno Pacifiers.
When Byakuran tries telling her to return them she states that what Byakuran has cannot be called Tri-Ni-Set because if the hearts of the owners are dark the Pacifiers will not show their true shine. She then proceeds to restore them with her power, which triggers Byakuran anger and greed prompting him to attack her and to force her back only to be stopped by Reborn's bullet who states that no matter the circumstances he cannot allow him to harm the leader of the Arcobaleno who he also states is the granddaughter of an acquaintance of his.
A few moments later, Byakuran proposes to Yuni that the Vongola Rings stay with the Vongola Family in exchange for her return to the Millefiore side together with the Arcobaleno Pacifiers. But Yuni refuses the proposal saying that she knows why Byakuran wants her back. She also adds that Byakuran does not have any right to the Tri-Ni-Set since the Vongola Rings and Arcobaleno Pacifiers are properties of the Vongola and Arcobaleno respectively. She swears that as long as her soul exists, as the Sky Arcobaleno that carries the parts of the Tri-Ni-Set, she will not allow any scramble for the Tri-Ni-Set. Moreover, she invalidates the Choice Game.
In response, Byakuran threatens Yuni that harm will befall the members of the Black Spell if she continues with the betrayal. But Yuni stays firm with her decision and once Tsuna got resolved with helping her, she proceeds to escape back to Namimori with the Vongola Family.
As it gets more and more difficult to breathe, Yuni uses her power to ease the breathing. After a while she gets exhausted, but was able to guide Reborn, and the other Arcobaleno to her location. She watches both Tsuna and Chrome get their inheritance. As she prepares to leave, she thanks Tsuna's mother, and the rest for their hospitality and goes back to the future with the rest to face Byakuran and the Six Funeral Wreaths.
At Kawahira's residence, Yuni was kidnapped by Torikabuto who was disguised as Lambo but later was defeated by Tsuna with the help of Chrome's Vongola Box Weapon. Yuni is later seen at the final showdown between Millefiore and Vongola. Yuni was summoned by the resonance of 2 strong Sky Flames into the battlefield where Byakuran and Tsuna were fighting. Yuni later sacrificed herself to revive the dead Arcobaleno by using her Flames, but it grew weaker because she feared death. Gamma later got inside the barrier due to Basil's Box Weapon and coax Yuni not to be frightened of death since Gamma will accompany her together. Yuni and Gamma then became the sacrifice to revive the Arcobaleno.
Yuni, before dying, told a few people from the past about Tsuna and the Guardians' battles in the Future using the Flame of Life.
Powers & Abilities
Yuni has the power to read people's mind and feelings; it has also been said that she knew what would happen to herself before she met with Byakuran. This Ability seems to be expanded to the Ability to see the Future, although that Ability has been growing weaker. he reveals that, like Byakuran, she also possesses the Ability to share her mind with the alternate versions of herself from different parallel worlds. She, like the other Sky Arcobalenos, Aria and Luce, has the power to revive or reconstruct her fellow Arcobaleno who have died temporarily. It also appears as though she was the one who willed the Vongola Rings to bring back Vongola Primo during the Inheritance Succession Arc. Additionally, the Tri-Ni-Set seems to respond to Yuni's wishes, most likely because she is the boss of the Arcobaleno to which Byakuran stated that the Sky Arcobaleno has much authority over the Tri-Ni-Set. During the Inheritence Ceremony Arc, Timoteo reveals that he knows everything that happened in the Future that Yuni sent him through his dreams.
- Yuni is incredibly nice, thanking everyone multiple times for agreeing to help her.
- In the Reborn! Fandom, her number is 01.
- Yuni has the cypher for the Tri-Ni-Set and says that she will not give Byakuran the cypher.
- Yuni holds all the Arcobaleno Pacifiers in the Future except for Colonnello's, whose pacifer is possessed by Lal Mirch.
- Like her mother and grandmother, she has the logo of the Giglio Nero under her left eye.
- According to what Lal Mirch and Reborn have said, Yuni's looks and personality are just like Luce's.
- She has a character song called Kokoro no Hoshi.
- The Character Bio for Yuni on the Official Reborn Anime Website mentions that she appears to be about 10 years old but was not confirmed.
- Like all Sky Arcobaleno, she has a relatively short lifespan. Her Grandmother died in her 30-40s, her Mother died in her 20-30s, and she herself died in her teens. This shows a pattern of consistently younger deaths among Sky Arcobaleno, although this could be purely coincidence.
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