I have a personal suggestion:
In future versions, you could make it so that players can create their own characters at the beginning, just like in "Deltarune".
In other words, the character created by the player is simply a "Player".
This way, Frisk can be played as another combatable character.
Furthermore, future versions will allow for a player vs. Chara & Frisk battle.
This also allows us to try adding Player vs Chara & Frisk in future versions.
Additionally, if possible, please remove Futa from Frisk, or add an option to make Futa an optional or deselectable feature.
P.S.: These are all suggestions that I think are good. As for removing the Futa option, it's because I personally don't like it...😰
Although this is just an Undertale NSFW parody game, it can definitely be improved.
One more thing: because my English isn't very good, I used Google Translate for all of this. If there are any odd word choices... well, I can't help it.