To expand a bit on what Kondziu wrote...

1) Order of the Stick invokes game-rules to be funny. Sure, there are a lot of things that happen because of game-rules... but the only times they are directly discussed by the characters is to either make a joke, or explain a change (such as Redcloak casting 9th level spells).

2) One can be Noble and Evil at the same time. Nobility of desire does not require Goodness of Heart.

3) Redcloak isn't out for "equal treatment for Goblins". He's out for "Goblins getting as much power as he can get for them."

4) Even before the publication of "Start of Darkness", there was a hint of "I'm only working for you because I have goals of my own" about Redcloak's interactions with Xykon.