Here are some ideas WE'VE mentioned before that you should listen to, devs, PLEASE!
Werewolf (speed based killer)
Shadow demon (Stealth based killer that can get INSIDE of walls)
Vampire (Surprise attacks killer)
Alien and Ripley (Need I say more...?)
Dr Jeckylls and Mr Hyde (Transformation Killer, Oni Like with COMPLETELY different habilities in each form)
Scarecrow (Jump Scare killer that places "dolls" that look like him)
Any other you guys wanna add?
Comments
I forgot four:
Pinhead
Candyman (I don't like this one but a lot of people do)
Jack the Ripper
It