I have finally decided to try my hand at a 6" scale Ganondorf from the Legend of Zelda Twilight Princess. If you know a good base figure too use, please let me now.
I'm actually working on a Ganondorf custom myself, although its a different design from this one. How does the person you're commissioning plan to do the head and face? I'm curious to know.
LCBH two-pack Wrarrl/Devourer of Souls perhaps (assuming you're going to sculpt/add the armor details)? Any type of knight-like character should work, at least for the body, I would think.