Sup fellow~ the mc plot envolves her losing her fear of getting hurt to protect people she cares about, so at first she will have an avoidant personality and the more the game develop she will get a imposing but friendly personality.
About the interactions the only obligatory sex part with the mc is what I show already ( just because the mc was unconscious ). From now on the player will decide how to handle the characters. So if you don't want the sex route with any man/woman/femboy/demon/(anything with a hole) you will not be forced to.
And the majority of characters will have the max relationship level as just friend, because some characters already have a partner or they just are not interested.