Quick Taro doodle trying to get her personality down. I imagine she would be a sort of shady merchant, sly talking people into buying things or pickpocketing them while they're distracted.
She would wear more than this in the human realm, most likely a robe or sort of kimono with a big fancy mask to cover up her...face. Or lack there of. But I was lazy and liked her pudgy belly too much haha.
She can sort of suck in her mouth-belly to hide her demon identity, but it's really draining for her so she can only do it every few days.