neo shadow and ansem since he is the only one to retain a hum an form
http://images3.wikia.nocookie.net/kingdomhearts/images/thumb/b/bd/Xehanort%27s_Heartless.png/480px-Xehanort%27s_Heartless.png
http://images3.wikia.nocookie.net/kingdomhearts/images/thumb/b/bd/Xehanort%27s_Heartless.png/480px-Xehanort%27s_Heartless.png