It was his real hair in this movie and I love it.
Loki → The Avengers ( 2012 )
You know full well it was your actions that brought you here.
I can see a pattern…
That is exactly how he belongs.
When Kurse is breaking out all of the other prisoners to wreak havoc during the attack on Asgard, he comes and he sizes up Loki. And even Kurse realizes, ‘I’m not gonna let this guy out. This guy’s trouble’. And as Kurse starts to walk away, Loki shows that he is trouble.
A Brother’s Journey: Thor & Loki Commentary
"And now you see me, brother"