Slender man simply because he is an entity. Neither alive nor dead. Jeff is an insane wicked twisted evil human but he is still alive and can die. But slender wouldn't really find Jeff an appealing victim as he prefers children or the slightly unhinged. Jeff wouldn't be susceptible to slender's mind games but the sheer power of an entity who can teleport, use procsy mind control, extend his limbs to impossible lengths and use tendrils/tentacles that can out mach any blade in sharpness, is irresistible. Jeff no matter how skilled or insane would be physically over whelmed. And if he DID injure slender, then slender would become enraged. A state in which he becomes faster more violent and him horrible horrendous mouth opens up to consume souls! Jeff is cool but slender is out of his league
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Slender man would win since he's immortal but Jason would always come back so there really is no clear winner.
Dracula!
Megatron
A man with a knife would win even from a distance of 18 feet away.
Michael Myers will. Wrong, Chuck Norris will. Its chucky from child's play not chuck Norris! Does not matter, anyway. Chuck Norris will win any duel, even those in which he is not involed.
none cause in one movie they did fight but they get hit by a car and 2 guys found Micheal and killed them and Jason will not die