The Rakshana
Amar- Kartik's brother, who is killed in A Great and Terrible Beauty. He also shows up as a warrior and leader of the Winterlands army in The Sweet Far Thing.
Hugo Fowlson- Miss McCleethy's lover and 'henchman' for the Rakshana. He helps Gemma in The Sweet Far Thing by going with her into the Realms to destroy the Tree Of All Souls. He has a scar on his face from where his mother cut him with her ring when she slapped him as a boy.
Lord Denby- Father of Simon Middleton (who was turned down when he had attempted to court both Felicity and Gemma). He is one of the most powerful members of the Rakshana and attempts to steal the magic from Gemma.
Read more about this topic: List Of Gemma Doyle Trilogy Characters