Who owns the rights to the following creepypastas?

I'm writing a bit of a crossover, and I want to know who, if anyone, I am to credit. So, any creepypasta experts out there? Who owns the following creepypastas/characters?
*Slenderman
*Jeff the Killer
*Herobrine (Minecraft)
*Buried Alive (Pokemon)
*The Nurse Ann
*Shadow People
*Hoodie and Masky
*Ben Drowned (The Legend of Zelda)
*SCP Foundation
*Eyeless Jack
*The Rake
*Lazari
*Lost Silver (Pokemon)
*Sally
*Sonic.exe (Sonic the Hedgehog)

I think that's it. If you know any of these, please tell me! Thanks!

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