Kenjaku is one of the primary antagonists of the Jujutsu Kaisen series. He is an ancient curse user who has existed for over a thousand years using his innate technique, which allows him to transplant his brain into other people to control them. He has inhabited different individuals throughout the centuries and assumed their identities.[2][3]Among those he has possessed include the blight of the Kamo clan who created the Cursed Womb: Death Paintings, Noritoshi Kamo,[3] the mother of Yuji Itadori, Kaori Itadori, and Suguru Geto, whose corpse Kenjaku is currently possessing to exploit his Cursed Spirit Manipulation.

Kenjaku's original voice is incredibly unique, as such I don't expect anyone to get it right on, with that said I would like you to take inspiration from the original; loosely base your take off of it. 

Voice reference: https://www.youtube.com/watch?v=pubJHmZAkpw he is the main male talking.