I honestly think that my choice is going to beat everyone's choices hands down, and I think some might even have to change their mind when they read about my pick. I would go with the peaceful Bonobo. It doesn't kill, it doesn't fly, it doesn't look cool, but it is the most awesome animal of them all. It is a close cousin to the more common Chimpanzee, but with one notable difference. Where as chimps can be very aggressive.
The Majestic Bonobo believes in making love not war. No I mean that literally. These animals are full blown nymphomaniacs. They use just about any excuse imaginable to have sex with one another, they aren't monogamous in the least, and they aren't particular about gender either. Their entire lives seem to be like one big party. They probably have the sweetest gig by far as the animal kingdom goes.
They are literally the next best thing to being human.