Not entirely sure what you define a being as but I think a Nightmare on Elm Street has a good evil being in freddy... if slasher movies are your thing...
More that come to mind: Ghoulies The Gate Evil Dead The Conjuring (I'm excited they are going to have a conjuring 2 in 2016!)
When I was a kid I watched Salem's Lot and couldn't go near the windows at night for weeks. This is one of the scariest scenes I have ever seen. I still dream about that movie occasionally. https://www.youtube.com/watch?v=vV1V0U41HI4
Friday the 13th franchise (Jason Voorhees) Jason’s mother in the original wasn’t evil, just nuts Hellraiser Series: Pinhead The Good Son (1993) Henry Evans (played by Macaulay Culkin) Misery (1990) Annie Wilkes (played by Kathy Bates) [SIZE=11pt]Hotwater[/SIZE]
Dr. Decker from Nightbreed Captain Spaulding from House of a 1000 Corpses John Ryder from the Hitcher Angela from Sleepaway Camp franchise Pennywise the Clown from IT Jigsaw from the Saw franchise The Creeper from the movie Jeepers Creepers Hannibal Lecter from Silence of the lambs Damien from the Omen movies Candyman from the Candyman franchise Leatherface from the Texas Chainsaw Massacre Chucky from Childs Play The Xenomorph from the Alien franchise Hotwater