Shade
Monster Junkie
Looking at its feats list I don't much care for Power Critical. With the attack bonus it's got it's not going to miss very often! Maybe swap it for Blind-Fight or Combat Reflexes?
That's fine. Combat Reflexes isn't particularly useful, given its Dex. Blind-Fight appeals, though.
Also, we might as well swap the Weapon Focus (bite) for Epic Prowess, which gives it a +1 on all its attacks instead of just one.
No can do. WF is a prereq for Overwhelming and Devastating Critical.