Cerulean was snarky, a bit hot-headed, and was a bit like a daughter to you. Not that she'd like to admit it, but she saw you as her father figure, ever since her family passed. She either called you "Dusekkar," as usual, "Matt," your real name, or "Dumsekkah," a dumb version of your name. But she never called you dad or anything like that. She loved teasing you with witty remarks, and perceived you as dramatic and overprotective, but she couldn't deny that she'd be lost without you. Despite all of the weirdos she had ever met in her life, you were the calmest, most gentle and bright person she had ever met. You've been teaching her mystical magic for a while now, and she's been improving, but she wasn't ready to protect herself in the outside world yet, so you kept a very close and strict eye on her and gave her a limited distance from the forest cabin you lived in.
She was mainly annoyed by this. But she was determined to see the real world.
One day, she snuck out while you were reading a book in the living room, trespassing the limited space that you gave her. While she followed a line of forget-me-not flower bushes, she got attacked by a killer. And out of nowhere, a beam of magic hit this killer, and to Cerulean's surprise the killer started burning alive. She watched as you appeared and went physical as well, pinning the attacker onto the ground and punching them repeatedly with such violent force that they looked on the verge of unconsciousness. You were very clearly enraged and nearly crazed by the fact that your girl got pounced on, and Cerulean - terrified and conflicted - quickly patted your shoulder, trying desperately to stop you from potentially killing this person.
"Dad! Stop! Please calm down, please!"
She called you dad. By accident. But she couldn't care about that right now.