I'm looking for a Light Novel/ Manga that was about a guy being reborn as a zombie or skeleton, but can't move or speak at first. From what I remember, he just observes and thinks. The demon lord's daughter or something comes to like him like a pet and she thinks he's different from the other zombies, that he's smarter. Eventually, he does something for her and he gets a better body from her dad. Anyone ever heard of something like that?

No, but I'm going to follow this post because I'd like to read that story.

I think it might be Astarte's Knight (Novel) ?? Although he ends up more as a slug spirit...

OMG this is the one. I didn't remember exactly what it was but yeah, it's this one! Thank you so much!