"Oh!! You can paint it over, I don't mind." Mina REALLY doesn't. She loves colors, her room is hot pink and purple and black and she has all sort of animal patterns. But the rest of her house and the dorms where she used to live in her world were pretty bland and normal and she was absolutely fine with it.

"It's normal paint, and it comes off with water too." water-based, that's what they called it. It also comes off with acid with low acidity too, which is easy to make if you are Mina.

But suddenly she gasps "Whaaa!!! Why didn't you tell me before if you didn't like it?!?!" she is not a mind reader, she didn't know! And he never complained!