Slap a red bandana on his head and Taylor Kitsch (known for playing Gambit in X-men Origins) with long hair is Gideon with perhaps the slight exception of his clean good looks.

I think Jeremy Renner would be a good fit for Alex. Their facial structures are similar and he is a very flexible and talented actor, so he would be awesome for the role.

I think, overall give Gerard Butler a few (Alot) scars, a bit of a receding hairline, and a lot of greys, and he'd make a perfect Mordecai. They even have the same eye color!

Travis Fimmel is, in my opinion an amazing actor. And his portrayal of Ragnar Lodbrok in 'Vikings' is very similar to Caine's personality - his playfulness, and wit, along with a sense of unflaunted maturity speaks volumes. Not only that, but he'd be perfect in aesthetics for playing Caine, I mean, I even have fan artwork of the guy for Caine's reference picture!

Probably the closest, but by no means a perfect match

Certainly the right facial expression. Considering that blake's looks are based of him it's the perfect match.

Now with the right kinda hair and facial hair. RDJ looks just right, if a bit too happy.