Hi is it possible to have Charisma 6 before endgame? i have finished all to-do list and seems cant be increased anymore
1. The "to do" list does not represent everything that there is to do in the game. It can be completely blank and the game can still have things you haven't done.
2. You can get up to 4 charisma points from advancing your relationship with women in the game. You get the points for being able to become someone's boyfriend, even if you don't choose to romance them. If you didn't follow a character's relationship path at all, or locked yourself out of it, then you don't get a point from that character. At least five characters can give you charisma points, so you'd have to neglect/fail two relationship paths to not have the maximum.
The characters I know of who can award you charisma points are: Primrose, Callie, Nell, Evelyn, and Samarra. For the first three, the point is gained when you get the choice to become their boyfriend, regardless of which option you choose. For Evelyn, IIRC, you gain the point when you remove the inhibition she has that stands in the way of your declaring your love for her. For Samarra, you must win a fight against her, choose to fuck her afterwards, and then you get the point when you talk to her after all that. (AFAIK, defeating her and then having sex with her is what enables you to partner with Samarra in the game's epilogue). (ETA: double checked Samarra)