Altielle’s rival from Suramar would be my best bet. Cylanni was always perceived as better at magic than Altielle. She memorized spells easily, her runes and circles were always perfect, and she had that crafty, smug attitude befitting of a future magistrix.
Then the occupation happened. Cylanni had a wake up call and realized there was more to life than parties and magic. She joined the rebellion, and during the raid on the Nighthold she had that fantastical showdown with Altielle that was always meant to be. Unfortunately for Cylanni, however, Altielle came out on top, burning her hands severely and nearly killing her.
Fortunately, Cylanni wasn’t alone and Altielle was captured. It took her a long time to recover from her wounds, but after hearing about a certain warlock resurging in the conflicts of Darkshore, she had no choice but to prepare for another confrontation. Cylanni made her way to Orgrimmar. Eventually. But along the way she’s become a bit different. More resourceful, less reliant on magic. She’s sort of become a bounty hunter for former Legion operatives, and it’s time to find Altielle.
In this other reality, Altielle instead dies from the failed spell that paralyzed her legs in the main one. Cylanni lives her life, joins the rebellion, then has nowhere to go afterwards. Her master, who Altielle murders in the main universe, is still alive, and all seems well. So where does she go?
Anywhere but Suramar. She has her health, her fortune, and her talent as a sorceress. She could go anywhere. So she starts off with Orgrimmar, learning about her new allies. One thing leads to another, and she falls into the place Altielle would have. Makes the same friends, but ultimately the connections aren’t as deep. She’s not Altielle, she doesn’t have that flare or charm mixed with that wicked warlock finesse. It would all be hollow, just like the relationships she had in Suramar.