Well you can work with him pretty good. High Sta and good Size almost enough to fully wear medium armor without penalty.

My first impression would be a "theatric" with almost any build, maybe a bit weak for the classic "counter attack build".
Or a good old trixster build!
Maybe a heavy armor slayer or a energy drain shadow, both classes would work fine and the low chi wont cripple them to much.

A war glad could also work, but its a bit of a stretch with the size stat.