imma respectfully say this is cap lol. first games game over has you stuffed into a suit with your teeth and eyes bursting through the suit, 3 has a rotting decaying corpse which you see a ton in detail inside of an animatronic, along with the person dying inside of the suit in a painful death, 4th has a kids head crushed in an animatronics jaws putting him in a coma, and Sister Location has two bodies hung up in what looks like nooses, and your main characters insides being scooped out so an animatronic can wear you as a skin suit.
I love both IPs, but saying Scooby Doo is more mature then FNAF is insane lol