Either create your own Equestria Girl OC as an Avenger or choose one that's in the list.This is Equestria Girls style,so yes, Spike is a dog.In case anyone wanted to know.
(NOTE:I had to play around with a few of the names.Please don't criticize me for it.Pinkie Pie is female,so she can't exactly be called Iron Man,and since it's Equestria and not America,I changed Captain America to Captain Equestria.)
Pinkie Pie/Iron Woman-
Applejack/Captain Equestria- @PoptropicanGurl
Fluttershy/Black Widow- @PoptropicanGurl
Rarity/That woman who gives Cap and Sam their gear back(I forgot her name,please tell me)-
Princess Luna/Bucky Barnes-
Princess Cadance/Captain Marvel-
Sweetie Belle/Scarlet Witch-
You can have two characters from the list,and as many OCs as you want.
GUARDIANS OF THE GALAXY:
Since there's so few of them,one Guardian per person.If you have an Avenger,you can take one of these at the price of your second Avenger.The same goes for villians.
VILLIANS:(I did put Trixie/Loki in both lists because Loki is more of a good guy the farther the story progresses,but in the first Thor movie he is definitely a villian.)
Nightmare Moon(YES,I do know she is Luna's evil counterpart,but I DON'T CARE,okay?)/Thanos-
Bio:Real Name//Superhero/Villian Name//Gender//Age//Looks// Personality//Crush/BF/GF//Friends//Foes//Likes//Dislikes//Other
Midnight Moon/Starfall(can open portals to different dimensions)- @PoptropicanGurl