Jennie sister from existing girls.

Apart from that more girls with medium to small tits and over-knee socks XD as that are my fetishes lol.

Also more girls who actually have more attractive avatars on higher affection levels. But that will never happen as they wont give higher stars avatars with girls that are dressed up ;] they take clothes off often including over-knee socks or pantyhose. Thou Bunny at 4* is actually nice (part her rack size).

If I was to specify game/anime titles/worlds directly, then maybe Monogatari series for anime (like me some long haired Senjougahara even thou she is on the high side of tit size for my taste ;]) and Majikoi for games (it had anime but it was more like a joke/promo for games). Majikoi would work here nicely cause its a porn game with a huge variety of girls (Kazuko for me plox) and body-shapes from lolis to huge-tits-mc-gee's, and various often funny personalities.

But then you could use any harem or huge female cast animes/games. Thou you could go gender-bender and use reverse-harem animes and just give us gender-swapped male characters. Thou not sure there is enough of perverts here who would want that, and there could be a big enough bunch who actually would hate those new characters.