Altough I read these two pretty long and viable replies to my plea, I have not enough time to reply with equivalent level of reply therefore I apologise. So for now I'll admit that maybe I'm a bit much paranoid about Queen and Elves but thats it. Future updates will bring more answers I hope. But I am still behind my words about Cass mostly and about that meaningless comparasion between Cass and Elin. Also I cut my point finger last night while carving so its pretty hard to write atm. Good days.
Is it the King or Cass I wonder.
No, you were correct. The only difference between them is that we know what Cass is doing while we only suspect what the big-tiddy queen is doing, and we haven't seen anything of the queen's history. Cass is responsible for the attempted coup, and the queen is responsible for Cass (and it is unlikely the queen didn't know what would happen), making them both fully responsible for the coup.
Cass is young and inexperienced, the queen is not. They both have ties to terrorists, Cass with her spies and connections to the west, and the queen with her spies and connections to the elf murder squads. They both spy on MC for similar reasons, with Cass wanting to start an manpire, and the queen wanting to start an elfpire. They are both friendly towards MC, much like Isis, for their own benefit. The queen, with her connections to the elf stuff, has likely done worse things than Cass, though only due to being alive for longer. They both worked towards isolating the king.
The only difference between them is the queen is experienced and patient while Cass is emotional and not very smart.