Arden and Lorne
So I have Lorne, who’s Arden’s older younger half-brother (isn’t death confusing?) and I can imagine him just being an annoying younger sibling. You said she was a leader and a bit of a control freak? He likes following other people, so they might somewhat get along through that.
He does have a tendency to beat around the bush a bit (a lot) though and has a pretty annoying personality, so I have no doubt he would irritate Arden through his general demeanour.
Arden and Kayin
Arden would not like Kayin. But Kayin, being a b@stard, would take great pleasure in causing her as much trouble as possible. She’s impatient with those who appear childish, and he finds great amusement in teasing just about anyone who’s impatient with or annoyed by him. A fun cycle of casual irritation.
Sorry- these are pretty rushed, just my first thoughts. I’ll check out Akio in the morning as I’m meant to be asleep right now, but I thought I should plan something with Arden seeing as her and Lorne are siblings.