To anyone who watches Vikings and True Blood. Floki(Gustaf Skarsgård) is Eric Northman's(Alexander Skarsgård) younger brother in real life.
I didn't realize this until I was watching a movie called The Way Back(2010) and noticed a character that I thought looked a lot like Floki. Sure enough, it was him and then I noticed the actor's last name and also noticed pictures of him and Alexander together. It wasn't until I looked up Alexander that it stated info about his family, and sure enough, Gustaf IS his little brother.
I am probably the last person that knows this. lol.