Hmm. A kind girl. Well trained hunter or sorcerer who is not afraid to kill when threatened. Trust not easily given and who hasn't sold themselves out to any patron good, neutral, or evil. No sass, but a sense of some humor. No need for crazy backstory trauma. In fact I would make it so she would try to leave once the tadpole was taken care of and you need to a pass skill check regardless of approval to keep her or be in a romance with her. Her excuse is that the party is crazy and she wants to go home lmao. Her character would be the grounded one to balance the others out. Closer to the MC in a way I guess depending on playstyle. Maybe towards the end she will gain some secret abilities, but without knowing the story it's hard to say what. Point being she would be just another wrong place wrong time like mc.