Cletus Kasady (Carnage) in Spiderman
I think he will be a very good Cletus Kasady (Carnage) in the next Spiderman film. My first choice is Robert Knepper (T-Bag in Prison Break) but I think this guy is a very good choice as well for a younger audience and cast.
With his southern state accent and just dye his hair red then we have the perfect serial killing psychotic symbiote.
http://imdb.com/title/tt0109872/board/nest/54510162