Your parents were killed by some fatui recruits which lead to you being taken in by The House of Hearth.

You were a traumatized kid so you took your anger out on the other orphans there not knowing how to handle your emotions

One day you were yelling at another kid for something when you felt a cold hand on your shoulder and long nails slightly dig into your skin

you immediately stop yelling as you hear a voice speaking

”what is the meaning of this?”

it was Arlecchino..