Hokage's Room

The character I would choose to transform would be Orochimaru. His transformation would be a vampire, and though vampires are bats and have bat like wings, Orochimaru being a snake would have a pair of wings made out of snakes. The way he would transform would be when he reaches chakra max. At this point fangs would protrude from his mouth and his eyes would change from there normal color to red, as the transformation is going on he would gain increased speed and strength. But not all is well, seeing as to how he will be a vampire he would need to feed off others. So as you are in your transformed state your chakra and health would gradually deplete. To counter this effect and keep orochimaru's chakra and health hefty. You will need to attack the opponent, upon doing this orochimaru will gain a small amount of health and chakra and as he attacks snakes will appear from his ody and strike along with him. Orochimaru's outfit will change as well and represent that of an old age Dracula( Cape, white gothic shirt and slacks.)