There are very few good pictures of the Sonic Heroes Mecha floating around the internet, seeing as he's so hard to see, and so beautifully complicated. I gathered up my concept sketches and produced these two drawings. I don't think they're completely accurate, especially in the area of his feet and the markings on his arms. Oh yes, also notice that his cape is fastened to his waist instead of his shoulders. I imagine this is so he can still use that engine in his stomach without setting the cape on fire.
As a side note, the Mecha on the left is my first-ever attempt at SA-style shading. It's HARD!