I screwed up the wording, it was supposed to be Nightmare before Kakyoin. But Night is an Undertale Au character, but Kakyoin is from Jojo, I know that.
Explaining how Kakyoin for Jojo could beat Nightmare; He can only be killed from pure positivity; "So you can just kill him with antidepressants"; "So you can just kill him with antidepressants"