Cleo. From Animal Crossing: Population growing. When I looks back at her even now I think she's quite cute. Some may think her eyes say otherwise. She was a cute little blonde horse, sparkley eyes, her coat/fur was close to a periwinkle I guess you could say, and she always wore any adorable floral dress. She was also very nice for a snooty animal. She was my childhood favorite, but never even made it to Wild World. She will be missed dearly. I hope she may return one day. Somehow and somewhere.
Bessie, bring back Bessie. For some reason she's the only cow I like. There was only 3 cows in New Leaf so I don't see why she could not have made her return.
Probably Bow and Meow. In future games, maybe all the E-reader card villagers from the first game could be sent into your game in the form of Amiibos or Amiibo cards? Just a minor idea.
Also Ketchup. Ketchup is love and Ketchup is life.