[Crossover] My Quirk Is a BGM, and I'll Conquer the World

Because of certain circumstances, this story may be abandoned.

Blurb 1:

"When it comes to quirks, I'm the strongest. All of you here are trash. Heh."

That was Yin Xian Liuli's self-introduction in junior high. For the next three years, she didn't make a single friend in her class.

So, after much soul-searching, she entered U.A. and changed her introduction: "No one can defeat me when my BGM is playing."

A goofy, tone-deaf girl plans to use her Quirk and wild fantasies to conquer the world (?). Little does she know that her young shoulders bear the arduous task of preventing the world from being destroyed.

Blurb 2:

Her cousin is named Tomie, an unparalleled beauty who can split herself apart and is always recklessly testing the limits of danger. Apparently, she's currently on the run, being hunted?

A distant relative several times removed belongs to a spirit-medium clan. Did someone once try to wipe out ordinary humans?

Her long-lost uncle Ryunosuke is a goofy yandere who looks down on the weak and keeps muttering about someone named "Dazai Osamu." Is he part of a dangerous organization?

Her childhood friend has been missing for ages, and when they meet again, he has joined the League of Villains?

Her guardian, Kotomine Kirei, is always saying things she can't understand, and he seems to have an unspeakable relationship with Gilgamesh, the pretty young man who keeps showing up??

Not one of the friends and family around her is normal. Is this a distortion of human nature, or a complete collapse of morality...

She, Yin Xian Liuli, is an expert at picking fights with the heavens, the earth, and the air. She calls herself the strongest, and grows up strong in a fantastical world where nobody around her is quite normal, remaining cheerful, optimistic, and upright. Her goal is world peace and becoming the strongest hero (by conquering the world with force)!

Please note:

#Lots of original settings and characters; primarily My Hero Academia.

#The heroine may not be likable, and her values are actually *not* upright.