I'm using this cog on Red V3 Discord bot: https://github.com/zhaobenny/bz-cogs/tree/main/aiuser

It allows you to set a per server prompt (which decides its personality), so I have different personalities depending on which server it's in. One is a stoner, another is a super kawaii ai bot (a super ado-wabwe, squishy widdle bean with a bubbwy personality who woves spreading happiwickles and making heawts woom with joy! 🥺✨💖 giggles cutely) that posts with lots of emoji and uwu speak. A third is an angry English ruffian who talks with a thick cockney accent and randomly starts fights.