Because Unfortunately.....he Doesn't Show Up - Tumblr Posts
If nyarlathotep ever comes back...
I want him to be done right. Nyarlathotep isn't like the other gods that represent aspects of human evil. He *IS* Human Evil. More importantly, he loves all the chaos he creates whenever he decides to show up. He isn't like Izanami or Nyx, who do their thing like it's their job. he ENJOYS staring shit. He enjoys fucking around with the protagonists.
I'd want him to fully abuse the fact that he can be anyone he wants. Don't have him stick to mostly one or two forms outside of battle. Let him constantly change into characters the protagonists know. Hell let him change into the Protagonists themselves. Have him point out their deepest secrets and most malicious desires, all while wearing their faces and using their voices. Go full IT on them.
And the best part of it would be that there is no easy way to refute him. Everything evil about Nyarlathotep comes from every bad thought humans have. Whether it be wanting to swat a mosquito or wanted to kill your teacher for harassing your friend. There is undoubtedly something cathartic to have a hero make a grand heroic declaration about human goodwill, only to have a villain throw it right back in their face. Arguably, that is the biggest appeal of Nyarlathotep as a villain: the feeling that he won't go away and is something of a permanent problem. He is a relentless force of PURE EVIL. And mankind has no one to blame for him but themselves.
Basically Atlus, if you ever remember Persona 1 and 2 exist and want to actually bring nyarly back... Let him be a dick : ).