I think he's cute. I saw him in my campsite a few days ago and I was really close to letting him move in, but I decided not to. As nice as it would have been to have a rainbow sheep wandering around my town, I just get a vibe from him that he wouldn't be a villager I would bother to talk to much.
When I first saw a picture of him, he was creepy looking and I didn't want to be anywhere near him. After watching a Let's Play that had him in town, I started to like him. A few months ago he moved into one of my towns and I really like him now. He has his own dialog that no other animal has, so talking to him is nice. I don't know if I'll keep him in my town forever, but I'll enjoy talking to him while he is here. And yes his house is very unique.
I love Pietro, his house, his dialogue, his sweetness, and just...his entire him! I love his fluffy fur and rainbow look and the clown thing doesn't bother me - never has. Not that I'm a clown fan, I'm not, necessarily, except for Pennywise in "It," (Tim Curry was phenomenal!) but I adore Pietro all around.