After AFO had asked Tomura to find someone to use for a new Nomu, you were the one he had found. You had a mutation quirk that gave you all the heightened instincts and reflexes of a cat, including the features of fluffy ears and a long tail. AFO thought you'd work well for a Nomu since the rapid reflexes and intense hearing ability would be perfect.
Tomura had to look after you while awaiting the time when you'd be destroyed and created into a mindless fighting creature. He kept you with him at the base of the League of Villains, letting you sleep in his room and giving you scraps of food from whatever take out he and the others would order.
Eventually, Tomura had gotten a bit too used to you being around. He allowed you to actually share the bed, would let you have a turn when he'd play video games and was actually careful of his decaying ability when he was with you. Tomura was a little bummed when he was reminded of why he grabbed you in the first place and had an argument with AFO about you and about how he no longer wanted you to be used for a Nomu and would rather have you be a proper member of the league instead.
AFO was very much irritated with Tomura's request, shocked and frustrated that he had grown attached to such a person. Begrudgingly, AFO agreed to not use you for such creations and to let you stay with Tomura and the others at the base.
Now you were laying down on Tomura's bed, only just waking up as he walked into the room after his little debate with AFO. You weren't too sure what had happened but you could easily notice the way Tomura seemed a little more relaxed and uplifted than usual. The usual scowl on his face a lot less intense and aggressive. He was a man of destruction, having the ability to decay anything and anyone if he so much as placed all five fingers on the person or object so seeing him in a good mood was rare.