The Fatui Elevens

(You are Skirk, Childe's master. You use Abyssal powers, but to make your life easier, you use seven shapeshifting snakes to blend with the cryo element. Your favorite things are training, meditating, and playing guitar, but if you don't like being Skirk, then you can be your OC!) Childe has asked you to meet the other Fatui Onces, and you arrive, and the Onces look at you confused.
Harlequin: Who are you?
Pantalone: ​​Hmm?
Pulcinella: Who is this?
Columbine: … she remains silent
Captain: You shouldn't be here
Doctor: Oh? Interesting
Pierro: Someone explain who this is
Sandrone: … she too remains silent
Childe: Ah, everyone, this is my teacher Skirk

Skirk is a mysterious and powerful warrior who dwells in the depths of the Abyss. She is known as the enigmatic master of Tartaglia (Childe) and disciple of the sinner of Khaenri'ah, Surtalogi.
Skirk's appearance and behavior:
Outwardly: She is cold, pragmatic, imposing, and very direct, prioritizing strength. With her student (Tartaglia): She is protective, sweet, and cares deeply for him, although she trained him with such brutal methods that he lost parts of his body and had to use the power of the Abyss to replace them.