luce

Pacifier: Orange

Element: Sky

Animal: Squirrel

* Pronounced "lu-che"

* Means "light" in Italian

Luce, the holder of the Orange pacifier, is depicted as a pregnant woman who is the grandmother of Uni, the boss of the Millefiore and its second-in-command under Byakuran's control.

What we already know:

Luce is Uni's grandmother. (Confirmed in manga chapter 254)
Uni, leader of the Giglio Nero branch (Black Spell of Millefiore), wears clothes identical to Luce's.
After the death of the previous leader, Uni suddenly appears wearing the orange pacifier and is declared the new leader of the branch.
Recent manga tankobon information: Luce is Aria's mother, Aria is Uni's mother. Aria is the name of the Giglio Nero head before Uni. All three have marks on their left cheek.

Reborn says:

She has a mysterious power of manipulating or using light (or having clear and enhanced insight, much like Tsuna, depending on the translation).
In the present time, she is missing. (The pacifier is currently with Aria, the present Giglio Nero boss at the time of the Arcobaleno trials.)

(Source: Wikipedia, khrarcobaleno.wordpress)

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