This list will consist of Marvel properties in no particular order that could become a franchise for the MCU franchise.
For part 1, go here.
Quick Note: There will be no characters that Marvel Studios does not currently have the rights to (i.e. Silver Surfer, Wolverine, or ROM Spaceknight)
The Nova Corps. was introduced in the MCU in Guardians of the Galaxy. In that movie they had uniforms that slightly resemble the iconic suit, but are not quite there yet. Perhaps it's because there will be a Nova movie in the future.
Greer Grant had adapted a more domestic superhero persona in the past as the Cat, but after she per-sued HYDRA near the Savage Land, she was gunned down by the agents, but some Ancient Cat People brought her back with a mystic amulet that gave her a whole new side to her, a powerful cat person called Tigra. The Cat could probably be introduced as a side character in a tv show like AoS or Jessica Jones, but then she could become Tigra in a future project like a movie.
The history of this character is a little convoluted, basically he is a superhero who could even beat Superman, who got his powers from a drug, but simultaneously created a dark-side to him called the Void. A movie for this character, admittedly, seems a little more likely than most of these other possibilities.
15. Hellstorm (Son of Satan and Satana)
These two are the offsprings of Mephisto, an inter-dimensional being similar to a demon from a dimension similar to Hell. These two could get a cool and thrilling Netflix Series.
16. Squirrel Girl
Doreen Green was born a mutant with a prehensile tail and attributes akin to a squirrel. She can talk to squirrels and is often seen with a squirrel sidekick. By the time she turned 14, she was determined to use her abilities to become a super hero. Clearly, she can't be a "Mutant" in this universe, so perhaps if she got her powers from a radioactive squirrel-bite or something would be more fitting. The best thing about her? She's charming, adorable, and unbeatable.
He was once a spry and chipper young hero called Speedball, he used his power to gain speed in an invincible ball of energy to help others, but after a horrible incident that triggered Civil War, the death of over 600 children. He felt so guilty, that he dawned a new suit, one that put over 600 spikes through his skin as his penance for his reckless behavior. This would make such a good Netflix Show, wouldn't you agree?
18. Moon Knight
Marc Spector gets his powers from the Egyptian god, Konchu. He has multiple-personality disorder, and he has an arsenal that could rival Bat-Man's. He was even referenced in Captain America: The Winter Soldier. His stories are fantastic and engaging, and although most assume we'll see him on Netflix in the future, I'd be willing to bet he makes it to the big screen.
19. Werewolf by Night
Jack Russel (ikr, dog puns ftw) inherited the curse of lycanthropy from his Transylvanian father. Though when he becomes a wolf, he can still understand a rationalize situations, and his wolf side has a sense of justice. The werewolf story is a little well-understood by audiences, it could still make for a thrilling Netflix story. Not to mention, crossing paths with super villains and other superheroes could make it much more interesting.
20. Brother Voodoo
Fused with the soul of his deceased houngan brother, Jericho Drumm became a white magic practicing sorcerer. He could go either way really. TV show or movie.
Wendell Vaughn was a SHIELD Agent who studied and protected alien quantum-bands, but after an AIM raid, he put them on and was granted incredible power. Quasar is a character who could be easily introduced in the MCU, but network tv show or movie is really the only way to go.