There are some ideas, but it's hard to decide on that, because of future plans, after all you're supposed to be able to get to know your daughters at some point.
And a new character is planned for each existing Neko.
If you get them pregnant more than once, it will break a bit the emmersion, since you will only get to see one of the daughters.
But nothing is set in stone yet and it's more seen as extra, because not everyone enjoys pregnancy.
The game is meant to offer something for everyone but at the end, people will complain about stuff and fetishes that are meant to be there for people that like it. You're not really meant to play with all character if you don't like what that character has to offer. Each character has a different way of interaction with the player and it's own kinks to offer.
Violet - Your waifu, that will be there for you and does everything to please you.
Lily - The innocent, playfull and a bit clueless Neko. She does a lot of things by instinct and just wants to have fun.
Chocomint - The perverted Mink Girl that will do everything to get your dick.
Cream - The Caracal Girl, a bit innocent but quite influenced by Chocomint's personality, she will trigger you when the situation permits.
Bera - Your waifus sister, she is a lonely Bear girl and just wants to feel the love her sister feels.
Autumn - The jealous fox girl, she is a bit of a bad girl, even if she regrets it sometimes. But she kinda wants what Violet has.
Ash - Your best friend, quite the unique dog girl companion. She will call you a jerk many times and won't admit openly her feelings about you.
Mitty - The mouse girl, one of the smartest ones, but also a perfect snack size. She always ends up in trouble somehow... Maybe she likes it?
Kleo - The oldest Neko of the island, quite misterious and big part of the story, she is a unique character that has a lot of secrets to reveal.
And this are all the main characters at moment of the game, the others are seen at moment as extra characters.