Villains Casting (Contains a spoiler if you haven't read Undivided!)
If this becomes a series as big as the hunger games, I think casting for Divan should be Christoph Waltz. Everything about Divan is interesting from his creepy collection to his high regard for loyalty and respect. He reminds me a lot of Christoph Waltz's character in Inglorious Bastards. And he's proven to be pretty good at being the bad guy. And he has a European accent which may help to capture Divan's characteristics more. Mads Mikkelsen or even Javier Bardem would do a good job methinks. Not sure of the budget but Divan isn't a huge character. Just responsible for Connor's unwinding!
Sean Bean might make for a good Nelson. Or even Gary Oldman.