Tuesday Top Five: It's Canon In Our Hearts

This week, I’m writing about five of my favorite shared headcanons/fanon across five different fandoms (listed in the order in which I discovered them). They vary in popularity, but I certainly didn’t come up with any of them on my own. Also, a couple of these ideas were later proven to be canon, but a noticeable number of people speculated that they might be true before that point.

Spoilers for The Magnus Archives, in particular, lie within.

( Headcanons! )

What are some of your favorite (or least favorite) headcanons in your fandoms?