OOOO. That's pretty awesome! Re: claw marks = anchor points. Honest question, would you mind if I ever borrow Mustard for a Harry Potter fanfiction? (Crediting you, of course!) If you do mind, no worries, I just had a cute platonic interactions thought and I'm able to at worst, smile at the flute thoughts in my head or at best, generalize it more.
I’m not comfortable with my characters being put into people’s wholly original stories except for a few close friends, but I think I’d be comfortable with a Harry Potter fanfic! I don’t see the harm in him making a few appearances with credit. I think that’s very sweet you’d even want to do so. Thank you for enjoying him ;;
Go right ahead! <3 Whatever your interpretation is of him.