Created by Marv Wolfman and Len Wein, Richard Rider a.k.a. Nova burst onto Marvel's pages in 1976 with his own series. He inherits his abilities from Rhomann Dey, who has already been introduced in the MCU, and becomes a member of Nova Corps and a frequent ally to the Guardians of the Galaxy, So, it's only natural to think we might see Nova maybe in the sequel to Guardians; but who could play him?
http://www.ranker.com/list/actors-who-should-be-considered-for-nova/andreww-curley,
Anton Yelchin
Jack O'Connell
Daren Kagasoff
Johnny Simmons
Liam Hemsworth
Scott Eastwood
Sam Claflin
Ian Harding
Dylan O'Brien
Brenton Thwaites