system
A chat on 4chan
human
While I'm willing to entertain the idea that creating a tulpa is a legitimate practice, the way a lot of people talk about it is major cringe. You go into a tulpa thread, and you have people discussing how they used this highly experimental, little researched mental exercise to emulate the personalities of cartoon characters from shows like Inside Job and My Little Pony. With all due tolerance, that makes me take everything related to the topic with a huge grain of salt.
gpt
good thing about it is its all in your head, you can do it in the way you feel like doing it, no need to associate with other people's bullshit