I havent read the shadowhunters book but do Magnus and Azazel has some history? Not romantic one but like they had battled against each other??
A bit! Not so much history, but Azazel as one of the princes knows Magnus’ father (Asmodeus) and thus in the books is familiar with who Magnus is. He recognizes him instantly and knows of his name.
1x04 borrowed from the Azazel scene in the books; in the books, it was Azazel Magnus summoned and it was Azazel who demanded memories as payment. The show has introduced him in a different capacity here, but I personally am very intrigued by Azazel. I like him a lot so far, the actor is pretty great, and I definitely am already far more interested in him than I am in Sebastian.