In this article, we pursue the study of the holomorphic dynamics of mapping class groups on two-dimensional character varieties, also called trace-map dynamics in the literature, as initiated in [44] (see also [20]). We show that the dynamics of pseudo-Anosov mapping classes resembles in many ways the dynamics of Hénon mappings, and then we apply this idea to answer open questions concerning
¶ (1) the geometry of discrete and faithful representations of free groups into ${\rm SL}(2,\mathbf{C}),$
¶ (2) the dynamics of Painlevé sixth equations, and
¶ (3) the spectrum of certain discrete Schrödinger operators