I am pretty open with canon points! With Tifa I tend to gravitate towards post-Remake because 1. that's what most are familiar with and 2. I don't really like how they woobified her in some of the other materials. But I can go with post-AC so they're matching if you like! ♥

As for Elsa, my favorite canon point for her is post-Frozen 2 just so she's genuinely happy. Which is also somewhere after Frozen 1, so that works well, or I can bring it back a bit earlier for some strife!