Daniel Gies posted 8 videos so far in his free series on character animation in After Effects. He discusses bones for puppets, sliders to control a rigged character, rigging multi-layered characters (in 3 parts), rigging clothes, and basic head rotations using 3D layers, distortion mesh & expressions in After Effects.
For more resources on character animation in AE, see Animate a character in After Effects at AE Portal (especially the links to Todd Kopriva's references and breakdowns on other tutorials).
See also Learn How to Rig and Animate a Character and Create your Own Odyssey Day 1 and Day 2 by Marcin Zeglinski, and Advanced 2D Cartoon Lip Sync Animation – AE Premium by Dave Scotland here at AEtuts+.
Here's a sample of the new stuff by Daniel Gies (also on YouTube):
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