3. Jocasta
In the same way that Frankenstein's Monster wanted a Bride, Hank Pym's artificial intelligence Ultron wanted a mate of his own and so created Jocasta. As if this wasn't creepy enough, Ultron went even further, going in an oedipal direction where he based Jocasta's mind upon Janet Van Dyne's, his creator Hank Pym's wife, even getting the name Jocasta from the wife/mother in the Oedipus story. Jocasta has been an unexpected problem for Ultron though, often thwarting his plans to help the Avengers as she objects to his evil side and destructive plans. She's even been regarded as an unofficial Avenger by characters like Captain America. Jocasta was also the original Jarvis, in terms of the movie Jarvis, as she downloaded her artificial intelligence onto the computers at Avengers Mansion and was Tony Stark's personal physician/psychologist during the years when people didn't know Tony Stark was Iron Man. Jocasta's connected to a number of characters in the MCU movies like Tony Stark, Captain America, the villain of Avengers 2, Ultron, and the Collector played by Benicio Del Toro and who will be appearing in the Guardians of the Galaxy movie. She would be a great fit if they were to include her in the movie!