This is one of Celestia's millitary air defense (MAD) mecha ponies! That serves in the world of Equestria.
I haven't had any specific character in mind when I made this, but I think it turned out quite well in the end.
And thanks for keeping me up all night on livestream so I finished this for today! The more I draw the better.
My Little pony - Friendship is magic (c) Hasbro