8. Red King
The Red King (Angmo-Asan) is the evil emperor of the planet Sakaar - the planet which Hulk crash-landed on in the Planet Hulk story arc. Therefore, his inclusion in a movie - even if it was just a mid or post-credits cameo - would indicate that a Planet Hulk movie was going to occur somewhere down the line - and that would be absolutely awesome. When Hulk is tricked in to exile (by virtue of being assigned the fake task of destroying a rogue satellite), his ship - which was destined for a peaceful planet - travels through a wormhole and ends up on the aforementioned Sakaar - a planet where captives are forced in to gladiatorial battles for the entertainment of the Red King. When Hulk, after a number of impressive performances in the gladiator arena, escapes captivity along with the rest of his gladiator comrades, he is hunted by the Red King's servants and this ultimately leads in to an epic final battle with the emperor, who uses a power suit that seems to help him go toe-to-toe with the green monster. Of course, in order for a Planet Hulk movie to occur, there'd have to be a reason for Hulk to be exiled (such as a World War Hulk storyline where he goes on the rampage on Earth), but seeing him lording over a gladiatorial fight - even for a moment in a cameo scene - would get fans around the world extremely excited.