Procedural Character Animation with Few Keyframes

HN points to it as a concrete case of procedural animation that keeps characters responsive, often in threads about Overgrowth and game feel.

David Rosen of Wolfire Games explains how simple procedural techniques can produce fluid, interactive character animation from very few keyframes. Examples come from Overgrowth, Receiver and Black Shades, from his 2014 GDC session.