Had an odd idea for something that is sort of like a variant of the Canadian.
Occultist Goose
A goose who, when killed, curses their killer to reduce the walk speed of their killer by 50% for an amount of time equal to the standard kill cooldown.
So a killer has a harder time fleeing the body and might have to report it themselves just to get rid of it. Or they could try and flee, but if they're seen walking slow it can make them suspicious. But there are also counters to this, killing near hiding spots means the killer can potentially just jump into the hiding spot.
The presence of this sort of goose can cause the ducks to have to consider their escape from a kill a little more carefully before they make a kill on the chance that their target might cause them this debuff, changing the dynamic. It makes areas near hiding places far more attractive kill zones as the duck can use that to escape if needed, while out of the way places may not be a bit more risky because getting out of there slows you considerably.
Extra bonus points, if someone claims Occultist in private to someone, you never know if the person reporting the body of the Occultist is self-reporting to get rid of the curse, or if the killer managed to get away and left the body for someone else to find.