If you were still looking for more suggestions here are some of the cute villagers that fit well on those Sanrio/pastel/kawaii islands
Cookie, Sherb, Diana, Marshal, Sasha, Merengue, Daisy, Gayle, Tia, Judy, Marina, Megan, Fang, Fuchsia, Flurry, Peanut, Chrissy, Franchine, Dom, Ruby, Lily, Sprinkle, Julian, Mint, Skye, Stiches.
You may have noticed I tossed in a few villagers with a white-ish color scheme, well in my opinion I think it's good to balance out islands with themes with those pastel villagers with one, maybe two white villagers so it's more balanced out plus white can go good with like any color scheme so it doesn't ruin the pastel colors.
These are just my opinions, it's up to you what you choose!