Mister Sinister, formerly known as Nathaniel Essex, is a geneticist supervillain who is obsessed with mutants.
If you're looking for someone who loves cloning himself in order to advance his plans for evil, you're looking at one in Mister Sinister.
Mister Sinister (real name: Nathaniel Essex) is an enemy for The X-Men, Cable and Deadpool and a powerful supervillain mutant whose bent on creating / becoming a being of genetic perfection and forcing the world's populace into the next step of evolution by weeding out those he believes are weak.