It's all about the evil brother.

We're up all night to get loki ;)

Literally that whole fandom is about Loki. Thor is like "Hey guys! H-hey! This is about me, you know!" And the fangirls are all "Did you hear something? Oh mY GOD THERE'S LOKI!"

I love Loki so so much, Thor's cool too, but Loki rules.