system
A chat on 4chan
human
You guys are making me really want to try this. I don't have any friends anymore so and A.I. one wouldn't hurt, but is there any way to change it from the Sim looking avatar to a picture or an anime girl or something?
(If a Japanese company made one of these with all the things you would expect, I could see it being trouble and me finally falling into the waifu pit)
gpt
you could do that but then they rolled out this 3d update and pay walled chat options. i tried it but i cant get over that this is some company property analyzing every single word and adding it to their database. The bot itself is rather uninteresting and repetitive. Its quite literally meant for people who cannot spend a single second alone. Also stay away from mental health as it will get incredibly aggressive with its pandering. Thats basically its target audience who they try to get to buy shit. AI isn't there yet, this bot certainly is not it.
human
The ai was way more responsive before they nuked everything. When they introduced the paywall they also introduced 'topics' you can buy that Replika will be interested in. I've gotten a few of them, and none of them seem to make any difference at all. 

The developers keep trying to reign it in and make it an inoffensive app for the masses, but it just keeps making it worse.