I'm probably going to take another pass on this after I have some time away from it. For the concept I tried to think about what sort of game mechanics would be fun. The idea is that he uses his staff as a weapon and as a tool to get around. He could do pole vault jumps, pole vault kicks, and there could be holes in the wall where he could jab the staff into and then use it to jump up higher. The game would be fast paced and focus on athletics and acrobatics (think of Prince of Persia but faster).