Mixamo is a great online service for auto rigging your characters, selecting from pre-made characters, and adding MOCAP (Motion Capture) animations to your characters to use with 3D Modeling software, game engines, and in virtual worlds. Click here for instructions on how to use Mixamo with Maya.
Here is a quick playblast video of my character fully rigged along with an idle MOCAP animation (with a bit of extra keyframes layered over it) inside of Maya
STEP 1: AutoRigger Tutorial – Mixamo
STEP 2: Maya Walkthrough – Mixamo