Summary
Pretty big future spoilers!!! As for Benno, I don’t think they have talked about his fiancée yet at this point? It’s implied she’s a huge part of why he takes a liking to her to the point people around him start noticing him changing and Mark even remarks how much Myne resembles his fiancée and how much more alive he seems when interacting with her. As for the the family, they actually do notice and talk about it. But besides her being on the verge of death constantly making it a far lesser worry, there’s also the fact that her father in his backstory is revealed to have been an equally huge weirdo and just as unreasonable growing up (wanting to become a knight even though he doesn’t have magic, etc), so presumably a lot of her weirdness gets ignored since they just assume she’s taking after him (and in the colour illustrations she even resembles him visually, having the same blue hair and yellow eyes).