I am in need of an Idea

I have been working on pictures of the The Avengers as characters of MLP as the heroes. I still need to draw Pinkie Pie as one of the members, only one problem....
who would fit her craziness and or breaking of the fourth wall? the only criteria are has to be Marvel has to be or has been a hero at one time preferably Shield or Avengers but will take other parts from marvel. please ask anyone to comment ask other bronies who like comics too would like to have it before MFF.
thanks to those who help and for the ones who suggest the winning Character i will do a random pick to find out which one will win a commision of there OC for MLPFIM on model for the show (won't be adult because i still haven't gotten drawing the naughty bits but mature and comedic mature is ok)
here is what i have already
Twilight Sparkle - Nick Furry
Rainbow Dash - Iron Man
Rarity - Blackwidow
Spike- Hawkeye
Fluttershy - Hulk
Applejack - War Machine
Derpy - Thor
Here is my Equestrian Version of the shield Emblem

Comments

[Makihooves]

the caption i made for the pic was What does Shield mean to you?
Somepony really wanted our initials to spell out shield.