We have already seen a live action portrayal of this character in 2007 by Nicholas Cage, and while the film itself was mediocre, Cage actually did a solid job as Johnny Blaze.
I will be looking for actors that can be arrogant, but also intimidating and can play a great anti-hero.
I think this would be a good up and coming actor for Marvel to get their hands on.
Reynor was on the shortlist of actors considered for Han Solo so that should tell you a lot about his attitude and acting ability.
Don't get me wrong, I would LOVE to see Hunnam land this role, but it would be difficult for him to differentiate the role of Johnny Blaze from his role as Jax Teller.
He is going to be in the upcoming Suicide Squad movie, so for most people that would immediately disqualify him from any Marvel role, but I don't see it that way.
He has the rough look from the classic Ghost Rider comics and is a great acting fit for this character.