Which character do you have to kill to make him cooperative again? Half joke, since too many RPGs have killing (or something equivalent) as their primary inter

Which character do you have to kill to make him cooperative again? Half joke, since too many RPGs have killing (or something equivalent) as their primary interaction. Geralt of Rivia must have extinguished the wolf population of entire countries, a band of Pokémon trainers would devoid an entire forest of animals to level up their pikachus, etc.