[xbuster]

If your into head transformation and arn't one to be queasy there is a lot of interesting process in the manga known as "PaRaSiTe". For those of you who haven't herd of it it's a story about alien parasites that come to earth and take over peoples bodies. The main character is infected but the parasite only controls his right hand. The bad guys in the story however use there heads as weapons and things. Lots of process so if your interested you should check it out.