I do like the idea that Genma's seemingly universal and undirected benevolence is just a byproduct of her lack of the usual human moral compunctions.
It's usually very tricky to have a likeable alien that isn't reducible to "secretly has a quirky endearing humanlike trait". To be a character requires their motives and personality to be legible - but she isn't a character: she's a demon wearing character skin, and her role within the storyline is similarly mobile. She doesn't need to cooperate with the surrounding narrative frame. I want to elaborate on this but it's too early in the story to say whether this will be a defining aspect of how arcs are structured and resolved.