Personification/Personified

Marie and Klaus

Blair has believed for the longest time that the life of hers Klaus loved the most was Marie, which is why she's shocked when his siblings answer simultaneously that it was actually Nysa.

Damon Salvatore and Andrea Pierce

Yes, I will take elements from Personification, Life After Life and ideas that didn't make it into either story.

I'm so very sorry this took me SO LONG to reply to! I haven't really been on very much. It was going to be discovered in Life After Life that one of Blair's past lives was made to forget about the existence of Werewolves so that filtered through to her future incarnations. That's why she didn't know anything about Werewolves and nothing clicked for her regarding that.

I honestly don't remember the very ending of where Life After Life was going, but I do remember that I did want Blair and Stefan to marry and it would then be revealed that he was the one who bought Wonderland and was the one who had it restored (the wedding would have taken place in the center of the garden maze)

After Stefan's death I think Blair would have gone to New Orleans as an attempt to get away and be around those she knew would never die - and when Klaus and Elijah do...Blair pretty much disappears until she's pulled back to Mystic Falls by what's going on in Legacies. (No idea if the timelines of that stuff lines up. Honestly I've never seen the last season of TVD or the Originals and have just seen stuff about it on tumblr)