Amy Farrah Fowler - Big Bang Theory
Applejack - My Little Pony
Arya Stark - Game of Thrones
I'm also a pretty big fan of most of the characters on Adventure Time, Fin in particular.

The classics:
Hawkeye, BJ and Trapper from MASH, all amazing.
Mulder, The Smoking Man and Skinner from The X-Files
And the "It's-" guy from Monty Python's Flying Circus. Everyone loves that guy.