I definitely think Erin and Luxanna could be bros. Luxanna's cheerful, adventurous nature will remind Erin of her sister which could fire up her protective side (especially since she's 6 years younger), but more than that, I think they'd get along splendidly. Perhaps they could be old friends since both of them are native to Goldcrest? What say you?
@simralin and Erika; well, sim is a ranger who does odd jobs for private hire. maybe Erika needs someone or something found and she hires sim to do it? sim is one of the people who is really apprehensive about magic but it actually secretly interested to learn more about it. are Erika's abilities known? if so, maybe sim (awkwardly) asks her to tell her more.
and luxanna; the funny thing is these two couldn't be more opposite but I see them being friends. Sim is super logical and not at all a dreamer, but I think she would look up to luxanna and think her a good person. I think it would be cool if these two opposites were good friends!
and astrid; I'm totally unsure what to do with these two XD