After a 10+ year time skip, Arabella would make an EXCELLENT Sorcerer Origin. Or an antagonist. Or a major supporting character. But Origin is better.
She is touched by both Sylvanus and Shar, possessing the power of the decaying forest. Then she is one of the only characters to interact with Jergal, who takes a special interest in her and shares his foresight of fate with her. This is important because Jergal is a mastermind conspirator who, according to Ed Greenwood, is 10 steps ahead of everyone. Jergal also only intervenes if absolutely necessary, and displays his first show of compassion in the entire lore(?) with Arabella.
A lot of recurring characters would make great Origins or Companions in future games, but that’s not the subject of this thread.
I also don’t think a character’s death in one permutation precludes them from being a future protagonist. Many characters that could have died permanently in BG1+2 appear in BG3.
