Pretty Actor Syndrome

A sudden outpouring of fangirl attention and love for a fictional character who has recently been portrayed by a conventionally pretty actor in the live-action adaptation. This often angers the purists and hipsters who liked the character before he became hot and popular. Usually applicable only to male characters.

Fanboy 1: Girls are going nuts for Loki ever since The Avengers came out.
Fanboy 2: It's Pretty Actor Syndrome, they're just here for Tom Hiddleston