[@BansheeChick]Awesome! 
Oh! Quick question! For Avengers, are you including Marvel in general? 
If only the Avengers, then I'd ask for you to play either Tony Stark "Iron Man" or Clint Barton "Hawkeye". 
If you're allowing all of Marvel, then I'd ask you to play either Wade Wilson "Deadpool", Peter Quill "Star Lord" or Scott Lang "Ant Man".
As for Doctor Who, I much prefer the 9th Doctor as he is my favorite. I have no problem playing the 10th, 11th, Jack Harkness or Mickey.