Character name: Satoshi Hiwatari / Krad
Video example: Music Video - The Blue haired boy transforms into the golden haired angel.
Why I think this is amazing: Satoshi is, despite his cold outwards appearance, a very sensitive boy. He struggles with the power locked inside of him, the alter entity known as Krad. I find it amazing because, at times, there is a actual struggle for dominance between the two of them. Satoshi fights hard to keep Krad locked inside of him, insisting that he does not need the others help to accomplish the goals set out for him by his father. Krad is a cold hearted being who plots to take over Satoshi's body and claim it for himself, so he will be free to live his life as he pleases. Seeing Satoshi struggle with the evil being inside of him seems almost as if he is struggling for his own humanity. It makes me sad when he seems to fall victim to Krad's strength of will, and the two converse in his head from time to time. However, Satoshi manages to impose his will on Krad in brief flashes of defiance.
Another thing I love about this transformation is the clear deceptive nature of it. Krad looks like a beautiful golden angel, yet he has the heart of a demon. He is murderous and cold. He does not care about anyone's desires but his own. You can literally see madness in his eyes when he get's worked up. So for a transformation into what should be a divine and benevolent being, he is utterly misrepresenting himself.
Another thing I like about the transformation, is that it is clearly unpleasant for Satoshi. When he transforms it is painful, damages his cloths, and you can see the pain in his face as he fights it every step of the way. That is why at times he seems to have one gold eye and one blue.