I feel like a lot of characters were just standard RPG archetypes with maybe a wrinkle added in. Like Wyll is the classic “Warlock that makes the deal for the right reasons” and the wrinkle is that he has dad issues.
Compare him to one of my favorite RPG companions. Classic elf wizard nerd with an abusive father that made him hit the books and hit him also… but because of his childhood trauma his soul’s past life, a foul mouthed woman from a long time ago awoke within him and sometimes he dissociates and she takes control because she wants him to be assertive… which, along with his fears of animancy, caused him to have an obsession with control, and why he accepted to join the baddies some time before you meet him.