The Marvel Cinematic Universe (MCU) is at the peak of its success and striding high, but there is one area which is still weak and that's their female superheroes. The MCU has an array of female heroes, there are Quake (Daisy Johnson/Skye) from Agents of S.H.I.E.L.D, Wanda Maximoff/Scarlett Witch who is seen in [The Avengers: Age Of Ultron](tag:293035), and the upcoming Jessica Jones Netflix show. If you include non-powered heroes you would add Black Widow, Agent 13 from Captain America: The Winter Solider and the upcoming Captain America: Civil War and technically Gamora from Guardians of the Galaxy.
Which, honestly, is not enough. Granted there are two more female superheroes that are planned to arrive - The Wasp (in Ant-Man and The Wasp) and Captain Marvel - but even then there are still many more male superheroes coming before them. So I have made a list of 4 female superheroes that should appear in phase 3.
She-Hulk (Jennifer Walters) is one the most famous Marvel super heroines and has been asked by the fans to appear for years. The cousin of Bruce Banner acquired a milder version of his Hulk condition through an emergency blood transfusion. The result, Jen became a large powerful green version of herself while still largely retaining her personality, intelligence and emotional control.
Even though she is a more famous female character, I do not believe her story could be a solo movie, but could work in TV or as a Sub-Plot of a film like Captain America: Civil War.
Tigra (Greer Grant Nelson) is a very interesting character even though she is no way near the most powerful female on this list. She is a founding member of the West Coast Avengers. She has super strength, agility, stealth, speed, stamina, reflexes and a healing factor. Her sight, smell, and hearing are superhuman and are also superior to those of ordinary cats allowing her to see farther and with much greater clarity, than any ordinary human. Her vision also extends slightly into the infrared spectrum, allowing her to see in complete darkness. Tigra's powers are a combination of science, magic, and mental energy thanks to the mystical Cat People (not a joke and too long to explain if you really want to know look Here).
Tigra is a very good character that could work as a Black Widow replacement if needed. I would say she would work better on Agents of S.H.I.E.L.D, but the amount of prosthetics required for the character would make it more believable that she would appear in films instead.
Songbird (Melissa Joan Gold) was once a villain known as Screaming Mimi but after some time, she joined The Thunderbolts - A team of rehabilitated super villains and given the name, Songbird. She uses a version of the technology created by the criminal, Ulysses Klaw, that converts sound into a malleable form of energy (or solid sound).
She could initially create simple sound/mass constructions and through time she has learned to create more complex forms. She can fly by generating solid sound wings attached to her body they are shown attached to her back.
Songbird is a character that is perfect for the films, if I had to make a comparison, she would be like Green Lantern but with sound and would be a strong member to the Avengers.
Spider-Woman (Jessica Drew) is an unique character for being created so another company doesn't steal the name (for example Wonder Woman DC and Wonder Man Marvel) and was supposed to be a one off character, but became a fan favourite, even getting her own animated TV series. Her powers come from her mother's womb being hit by a laser beam containing the DNA traits of several different species of spiders whilst her mother was pregnant (the Drews were scientists trying to splice and harness spiders environmental adaptive capabilities).
After Jessica's parents disappeared under mysterious circumstances, Jessica is recruited into HYDRA (under false pretenses), where she is made into a formidable fighter and assassin. She is trained and mentored by Taskmaster, who schools her in many martial disciplines and more than seven different fighting styles. But turns out she was using HYDRA to get information on what happened to her mother.
Spider-Woman is a great character but will most likely will not be used in the films just because it would make spiderman less special but could arrive in Agents of S.H.I.E.L.D as a special agent like Mockingbird.