The core group rotates around Feyre Archeron as our point-of-view character. She's the human huntress thrust into the faerie world after killing a wolf. Across the series, the central figures shift, but the consistent heart is the Night Court crew: Rhysand, the High Lord with a morally grey reputation that gets completely reframed; his inner circle including Mor (the vibrant third in command), Cassian (the brash Illyrian warrior), Azriel (the quieter, shadowsinging spymaster), and Amren (the ancient, terrifying being in a small body).
Honestly, Nesta and Elain, Feyre's sisters, start off pretty polarizing in the first book—some readers found them insufferably passive while Feyre risked everything. That's actually a deliberate setup, because Sarah J. Maas spends later books, especially 'A Court of Silver Flames,' diving deep into Nesta's trauma and perspective, which totally recontextualizes her earlier behavior. Tamlin, the Spring Court High Lord, is a major player in the first book as the initial love interest, but his role... evolves, let's say, in ways that spark endless debate online.
Lucien, Tamlin's emissary, is a personal favorite of mine—his sarcasm and complicated loyalties make him a wildcard. The King of Hybern serves as the primary antagonist in the later arc, though the more interesting conflicts often feel more personal between the courts themselves.