Creating the Gold Standard for Addons: Michael Myers
Before we get another killer, I would like to voice my opinion that in Dead By Daylight of all the killers available so far, Michael Myers is by far is the most well-designed killer in terms of addon design and addon balance.
Every single one of The Shape's addons can be used in a viable build. No shortcuts or 'lazy, uncontroversial choices' were taken in the design process of any of his addons. Notably, The Shape doesn't have any terrible status effect addons.
In fact, the only addon of his that I think needs minor tweaking is Vanity Mirror because the movement speed tradeoff is too harsh for what it gives as benefit in comparison to Scratched Mirror.
Every new killer's addons should be held up to the same standard as Michael Myers.
During the design phase, whoever makes the killer's addons should ask themselves, "Does this addon meet Michael Myers level of quality?"
That is all.