While some of you are debuting on who should appear as the Masters of Evil for Avengers 2, here is my suggested thoughts on who Whedon should include as the members and it's the most logical for the sequel as well and very interesting as well
With the Avengers 2 script underway, director Joss Whedon hasn't announced the movie's villain. Which is good, because with Thanos being saved for Avengers 3, we like Whedon to take this opportunity by having the Mad Titan anticipate SHIELD's group of remarkable people by assembling supervillains to fight them known as the Masters of Evil.
For the Masters of Evil to appear in the film, Joss Whedon is going to need to find some villains who have survived in the previous films and some new ones who haven't yet appeared in the Marvel Cinematic Universe.
First up are the three highly speculated villains that will be leading the gang in the sequel:
Ben Kingsley as The Mandarin/Trevor Slattery (Leader of the Masters)
Sure because of the twist, Trevor was just an actor and that Aldrich Killian was the "so called real Mandarin" that instead of doing the character properly they just purposely screw him up and get it over with over such bulls*** opinions about his looks when he was originally designed. But if Kevin Feige knew that twisting and violating the character was going to upset lots of people and start causing real problems, they definatly would NEVER do that without having other ideas planned, esspecially when Ben Kingsley's Mandarin is still alive and because of Killian aka Firebrand framed Trevor by setting Trevor up as the Mandarin by making him think he was just acting for a movie when he was actually making him look like an actual terrorist in front of the whole world, in spite of Killian calling himself Mandarin and despite Shane Black making the power ringless character who uses Extremis the MCU's interpretated Mandarin over no reason but stupidity of expressing the people using people as masks theory from the Dark Knight Trilogy and despite Pepper killing Firebrand, it's highly doubtful that we have seen the last of the Mandarin. Because of how epic the Mandarin is with the 10 power rings, Iron Man 3 maybe more of a phase one go on the character's appearance and due to some of the rumors of Kingsley reprising his role as Mandarin in Avengers 2 when both he and the sequel shootings are in India next year as well as some of the casting rumors of other films being denied and then actually confirmed, it's very much so that Avengers 2 is where the Mandarin will return and emerge as the real ring powered super villain everyone knows best from the Marvel Comics. Thanos would be the one to speed up the process by giving Trevor the 10 cosmic rings not by potential but because of what he seeks inside Trevor that the character the same thing that Killian had; desperation. And because Trevor was once a bankrupted actor and is now more ruined than ever, the power rings should suit him good as he will use them to help take back what he had lost of his drug addictions and as the Mandarin, he was mentioned by both Extremis creators Aldrich Killian and Maya Hansen as The Master which hints that Joss Whedon will use Mandarin/Trevor Slattery as the leader of the Masters of Evil once he confirms him and by the act of bringing him back for Avengers 2 in a "Frankenstein's Monster" like method and by making sure he aquires the 10 cosmic rings to battle the Avengers and lead the Masters of Evil, Whedon will EVOLVE Trevor into the Mandarin we all rightfully deserve to see as the villain in the Marvel Cinematic Universe. After all as he was referenced by Tony "We create our own demons", it just might mean that Whedon will intend on making what doesn't really exist come into reality of the MCU which would also give Tony a good reason to come back to the Avengers as Iron Man in person without doing the armor remote control style. And what could make Trevor capable of using the rings to battle the Avengers than to suit up as the Mandarin in Dark Armor?