Some Perk Ideas. Add your ideas to the comments.
Survivor:
Hysterical Strength: Being chased by someone trying to kill you is terrifying. When throwing down a pallet, successfully stunning the killer will break the pallet, but the killer is stunned for 50/55/60% longer.
Autophobia: If you are the last survivor in the trial, this perk activates. If the killer picks you up, the nearest hook breaks, and you wiggle 25/30/35% faster.
Like A Whisper: When you successfully win a chase, your scratch marks will not be visible and you will run silently for 6/9/12 seconds.
Killer:
Hex: Impatience: Whenever you hook a survivor, gain a token. Each token increases the speed you gain bloodlust by 6/8/10%. You can only have a maximum of 4 tokens.
Sore Loser: Whenever you are in a chase for at least 10 seconds, and lose it, gain a token. The token will give you a 1/2/3% speed boost. Every time you injure or down a survivor, you lose a token.
Hands Off: Whenever a survivor starts cleansing a dull totem, they receive blindness and oblivious. This effect persists for 10/20/30 more seconds if the survivor successfully cleanses the totem.