Director Kakuzawa

Director Kakuzawa is the true antagonist of Elfen Lied. He is the head of the research center, at 70+ years old performing experiments on Diclonius. He is from a long line of Diclonius ancestry that has been watered down by inter-breeding with humans (much of this is, however, only revealed in the manga). As a result, he has no vectors and much smaller horns on his head, which he hides under a wig. His and his son's aim are in part to replenish their bloodline with the Diclonii they are experimenting on (of which Lucy is the first to be able to reproduce) and thus gain power as "kings" of the new race, which would wipe out humanity and replace it entirely.

In the manga, he even claims to desire the position of a god of the new, Diclonius-ruled world he envisions. He is the father of Anna Kakuzawa, professor Kakuzawa and Lucy's Diclonius half-brother. Even after revealing to Lucy all his plots to terminate mankind and to fill the world with Diclonius, he is decapitated by Lucy along with his Diclonius son. She then reveals that he is not a Diclonius at all, and that his horns were the result of an unrelated mutation. In the anime, he is not killed, and continues with his plans.