Without a doubt, Marvin is my favorite Martian.
Marvin has this preoccupation with the people (insects) of the tiny blue planet known as Earth. This preoccupation has led to a number of altercations with the tiny blue planet's inhabitants, including our beloved Bugs Bunny and, of course, Duck Dodgers of the 3rd Dimension.
He's hip on newfangled technology and an ardent supporter of the right to bear arms, possessing his own Acme Disintegrating Ray Pistol and being quite adept with a PU-36 Space Modulator. Without hesitation, he'll use both to defend the red planet known as Mars.
Yet his existence can be rather lonely. I've never seen a Mildred, Martha or Mary Ann the Martian. He did, however, have K-9, his trusty four-legged companion. And we do love those who have trusty, four-legged companions whether they be flesh and bone or not.
And I am convinced that we have Marvin to thank for the huge success of NASA's Spirit and Opportunity rovers. I fully expect we'll find a little Marvin DNA under one of those red rocks someday, possibly around the icy polar regions frozen alongside a biggie-sized telescope or an atomizer.
Marvin is definitely my favorite Martian--until you've made him very angry.
So who is your favorite Martian (or alien?)