Are Slender Man, The Rake, and Brutal Obscene Beast all the same species?

not the same species, but all related

slendy has a very long and detailed history
(and iirc 5 interconnected stories)

check it out at the Creepypasta wiki

Maybe.

no theyre not. But theyre related. BTW Du should be asking this stuff on the Creepy pasta, nudeln club, not random. Some people prob dont even know what youre talking about. I learned that the hard way

No because the rake is ...... I don't wanna know what the rake is non do I B.O.B cuz them to r HORRIFYING !!!!!