Ansem is, thus far, one of only two Heartless with human-level intelligence, the other being Sora's Heartless. His knowledge of the worlds and hearts shows that Xehanort's keen intellect has survived the transition into a Heartless. However, what little shreds of humanity remained in the researcher have been obliterated. Ansem is cold, calculating, and utterly ruthless. He treats people and their hearts as either tools to be manipulated and disposed of, or of nothing more than cattle for himself and his ravenous Heartless legions. He reveres power and knowledge above all things, and despises ignorance.

Voice Example: Billy Zane as Ansem in Kingdom Hearts (Dialogue Quotes) - YouTube