To put it shortly, Mordecai Daphrey Feathersone (the one on the left) is one of two owl brothers that both delight on stuffing themselves silly with various preythings. He also has some slight magical ability, mainly in a sweet, hypnotizing/charming breath he can puff out onto people, the ability to change his own size, and somehow being able to fly around despite his obvious girthy stature.

Montague, his brother, is played by Vox, aka http://www.furaffinity.net/user/xionzappa2/ , and the art was made by http://www.furaffinity.net/user/rocketgal .