[quote=@Superboy]
[@BlackSam3091] I've actually never seen Supernatural or Buffy, and haven't even heard of Grimm. The parallels are honestly pure coincidence. 
[/quote]

This wounds me. Well not the Supernatural part, but Buffy and its spinoff Angel are definitely worth watching. I, personally really enjoyed Grimm but I'll admit it's more of a niche show.