I mean not a human, but a pony with a similar personality.
he likes small animals but doesn't like big groups like Fluttershy, the difference is he reacts violently while Shy runs and hides

so good idea or bad?

4708633
I never really seen or heard of that anime so I can't tell if his personality would fit with her brother yet. But we really don't if what episode is about yet there are some rumors that it going to another map episode. So only thing I could say is this maybe.