So, now that I've developed more of Issac's back story and figured out that his parents are an indeedee and persian (they're gijinkas so it can work, hush), I decided to give Issac the option of ears like his father's (the persian). They come along as he matures (much to his surprise), but they're cute so I'm going with it.

Issac © me
Indeedee © Nintendo