While the hype for The Avengers in 2012 is killing me to even think about (Even more torture to write about, i love you guys so i will push through my hype!) Sequels are being passed around like brownies in Marvel: Iron Man 3, Thor 2, possibly Captain America 2 and other sequels and all new movies. When asked the question about keeping the team together or seperating them into new teams as the movies go on Kevin Feige was stated saying "Absolutely. That's the fun of it -- introducing new characters," So let's go down a list of possible "New characters they can add."
Without keeping the core concept of the big three or four of the avengers would probably lead to nerd rage, lets say they just keep Captain America, Iron Man, Thor, and Hulk the epic combination of Human, Machine, God and Hulk. Alot of other Marvel Characters have been in The Avengers over the years so here comes my list of characters that have more than enough right to be in the movie and on the team:
Hugh Jackman aka Wolverine:The entire reason for him being on the team at first was because they needed someone who would kill without question and there enters Wolverine. I feel that he needs no introduction and can easily be added into the movie without hurting any story elements movie-verse wise, plus seeing him go at it with the team wouldnt hurt. Lets not forget the icing on the cake HULK VS WOLVERINE! Seeing that live action sure as hell would be a treat.
T'Challa aka Black Panther:I would hope he makes his live action debut as an avengers member but i feel like he deserves a little more of a spotlight than just introducing him right away, Although Wakanda is an easy place to refrence and go to think about where Cap would get a new sheild if Iron Man cant make another one and then vibranium can be a plot point in the sequel.
Ant Man and Wasp aka Hank Pym and Janet Dyne:The Avengers couple that made it first on the team, if all goes according to plan and they can land there own solo movies the sequel of The Avengers is a peice of cake for them. Will be nice to see them appear in a movie and do some work on the team.
Scarlet Witch and The Vision aka Wanda Maximoff and Vision Shade:Another power couple among The Avengers this would be harder on Scarlet Witch's part being the daughter of Magneto and all. If there thinking of adding her they would have to do it strategically and not just skip past years of X-men stories just to add her in, Wanda and her powers are something and rarely seen in comic book movies now a days reality manipulation would be a great power to add in the end. Vision is easier to add since he's the teams informative officer and there machine when they need there info quick.