Lord Corpse "Lord Cadaver, Commander, The Count, The King of Necrophilia"

About

Lord Corpse is the Frankenstein creator who set up his base of operations in a village of constant thunder storms. After spreading fear and terror there for a year, John Doe was hired to kill all of his Frankensteins. John and Rose then killed the Lord for their own purposes.

It's unknown when he exactly he turned into a Frankenstein and became the leader of Blitz Guruda.

(Source: Embalming Wikia)