Huh, thinking about it, I'm more interested in time travel in fic than in canon... And yeah, I too love time travel stories when/because they often combine many tropes that I love: canon-divergence, secret identities, being secretly competent, there's often a lot of angst; also, you can have pairings/relationships not/as easily possible in the original timeline, and depending on how far you go back you can also have culture clashes... Lots of great possibilities :)

Thanks for the recs! I'll try to make a list of my favorites.