I mean I think it's fine, although the character type that usually is associated with characters like her is done in an offensive way in other medias I think if the author handles it well it should be fine. The reason why I am say this is because of the way we see other characters interact with her and so far even though it is just with our skeleton he has always referred to her with the right pronoun and hasn't really questioned like you would see in the offensive ones plus he has in no shape or form disrespected her just in awe from how strong she is. Though he is a skeleton so I'm not sure how the humans would react but we can observe later. besides so far with how the author betrays the female characters in this series is in my opinion very good. they are full bodied characters and they aren't just plot points for the mc. I am actually looking forward to seeing more of this character in the future.

Not sure how I shall feel about "her"...
Is that character offensive or acceptable?....