For me, Legion’s Thalyssra, Prince Farondis and Illidan were pretty cool.
I liked BFA’s Jaina and Azshara too
I liked Tyrande in 8.1 and all the shadowlands cinematics. Lovely arc.
I loved Anduin from the BFA pre quel,
And I’ll admit it, I like that Sylvanas is saved somewhat rather than destroyed. I think it’s far more interesting to explore what she would be like now than simply killing her. Though I find the dev boner for her so creepy.