Hey!
I think Ace and Aideen would be really interesting. Since they are both rather competitive and looking for attention I imagine they would probably start off as rivals but could definitely grow to be really good friends.
Margo would probably annoy Aideen a little bit but if she was persistent would most likely grow on her. Once she had Aideen might find Margo a little entertaining and at times mess with her not to be mean but for a bit of fun.
With Ducky that could be pretty interesting as well. Aideen's the type of person who if someone tried to stand up for her she would just tell them off and be quiet rude to them to begin with but she would also feel like she owed them for it.
I'm up for an rp with any of them (though I think Ducky and/or Ace would probably be the most interesting).
Also just so you know this will be my first rp so if I'm not being detailed enough or something in my posts could you please let me know so I can improve?