Try doing something that not many people know about, try looking up mythical creatures or beliefs in certain areas (south america, asia and scotland are good for them) about the monsters they have
Have you heard of the show lost tapes ? You should look it up, it'll give you do many different legends/monsters to choose from. I say jersey devil.
How about the Succubus? The beautiful she-devil who seduces men and devours their soul.
Ah, go for Big Foot! They still have TV shows about trying to discover him.
i think i am going to go with this one because i love succubus
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Slender man or the rake.....
The Boogie monster..
The shadow people.