I know how to make a shapeshifter killer work!!! (Maybe)
Ok so the killers main ability is called shapeshift (duh) and it can transform into any other killer in the game and will gain their power and movement speed. It has a cooldown of 80 seconds (changed with addons) and you stay in that other killers form for 60 seconds. However it has a secondary power which will allow him to remove his terror radius and red stain but will but at the cost of blurry vision. If I come up with some more ideas I'll update the post.
Comments
I always thought a shapeshifter would be cool if they could imitate the survivors they have attacked to lure others in. This would give survivors major trust issues.