I haven't even managed to get him yet, but I still love him nonetheless. He reminds me of one of my favourite musicians David Bowie because of the heterochromia, and his original clothing with the waistcoat just looks really cool and unique compared to most other basic villagers. To be completely honest though, the main reason I really like Raymond is because of my head canon ship of him and Marshall. I love creating villager couples on my island, and that ship is definitely my favourite one by far. I can just imagine them both sitting down in a little cafe and chilling together while drinking a coffee and reading the morning newspaper.
Ok whew that got out of hand, TLDR; I just really like Raymond I guess haha.