Okay so for those who really have no idea who he is.....
Jack O'Connell is an English actor best known in the UK for playing 'James Cook' or just 'Cook' in the UK (and original) version of Skins (Basically a teen drama that occasionally was very good) before that he had a role in the Shane Meadows movie 'This is England' as a young skinhead as well as other television roles.
He has starred in movies like:
Eden Lake - A British thriller in which O'Connell is the leader of a gang that terrorize a couple who happen to be Michael Fassbender and the chick thats banging Jude Law in Sherlock Holmes.
Harry Brown - Michael Caine is pensioner who happened to be a bad ass soldier and goes up against a gang of youths, O'Connell plays one of these youths (SPOILER) what happens to him is funny.
As well as Tower Block and The Liability (I'd strongly suggest watching The Liability)
Anyway to point, O'Connell will appear as Calisto in 300: Rise of an Empire giving him some experience in comic book movie industry and when I heard that he was one of the top candidates for the role of Reed Richards in the reboot of Fantastic Four I was really excited but realized I'd rather see him play Johnny Storm than Reed due to his youthful ladies man appearance and well I haven't seen him play a smart guy like Reed.
When playing the role of Cook in Skins he showed he can do the whole Violent role and he could be pretty well suited to some roles in the Marvel Cinematic Universe so I'll name a few characters I can see him suiting up as.
5. Chase Stein - The Runaways
Remember when there was going to be a Runaways movie??? Yeah and then there was one but it was about Joan Jett? well I think O'Connell would easily fit into the role of Chase a character who at first was a bit of a joker and his parents were ass's too him yet once he took responsibility and not to mention his dads gear he because a cool character (to the Runaways standards) Anyway I can see O'Connell with a pair of Fistigons.
4. Bullseye - Daredevil
With talks of a Daredevil reboot on the table which villain better to go with than Bullseye, O'Connell would make a cool Bullseye in my opinion and judging on certain roles I've seen him play combining them could make a really great Bullseye, for instance the evil little bastard he played in Eden Lake who gladly hunts down Fassbender and that chick (I really should look up her name for this) combined with the Fun Loving Cook from Skins would could easily hold his own in a fight those two roles alone including the classic Bullseye costume would be great.
3. Noh Varr / Marvel Boy - Captain Marvel
Okay if they were to go with Captain Marvel on the big screen I think it would help unfamiliar audiences if you played with the idea of the young Noh Varr taking the role of Captain Marvel, They basically have the same powers and obviously Noh Varr was introduced as a young Captain Marvel, The reason I think this would help unfamiliar audiences is because making the character young he is learning things along with the audience I mean you could just make him Mar Vell just alter his story a little.
2. Johnny Storm - The Fantastic Four
Okay as I said before although he has been rumoured to be a candidate for Reed I think he would make a much better Johnny as again referring to the character of Cook I've seen him play the 'Jack the Lad' who lives to have a good time, How better to describe Johnny the Human Torch, I can see O'Connell flamed up and flying around the place he could even give a little more of a gritty tone to the character occasionally giving the odd threatening remark to who ever the villain is.
1. Richard Rider - Nova
Okay this is the role I would love to see him play as I can picture O'Connell in the costume holding the helmet in his arm I just think its one of those casts that would work well.
Plus I would love to see an actor like Jack O'Connell learning how to use his powers as Nova and flying off into outer space, again I've seen his fight in roles and I can see him as the easy going Richard Rider Nova maturing as he realizes how important his role as Nova is.
So thats my opinion would you guys give him a chance?
Oh and just for the fun of it heres a cool 300: Rise of an Empire poster featuring Jack as Calisto