https://www.inworld.ai/blog/what-is-an-ai-character
https://www.inworld.ai/blog/have-a-chat-with-ai-characters-from-wonderland
AI characters can be fun and exciting things.
https://www.soulmachines.com/technology
https://www.popularmechanics.com/culture/gaming/a10698/inside-the-mind-of-the-sims-4
They can be multi-beneficial tools.
https://blog.readyplayer.me/series-b-announcement-a16z , https://wolf3d.io/about-us , https://readyplayer.me
The Sims:
https://screenrant.com/sims-ea-patent-ai-character-create-creator-technology
However, what might happen if ever a fully sentient AI program entity goes into total runaway mode?
The 1995 movie Virtuosity provides an interesting cautionary depiction.
"In Los Angeles, Lt. Parker Barnes and John Donovan are testing a virtual reality system that is going to be used for training police officers. The two are tracking down a serial killer named SID 6.7 at a restaurant in virtual reality. SID (short for Sadistic, Intelligent, Dangerous, a VR amalgam of the most violent serial killers throughout history) causes Donovan to go into shock, killing him..." https://en.wikipedia.org/wiki/Virtuosity#Plot
https://www.cyberpunkreview.com/category/man-machine-interface
What if a brain chip is like its own AI character?
The 2018 movie Upgrade depicts how an AI program eventually takes over a person mind and body.
"Grey Trace, an automechanic, lives with his wife Asha who works for Cobolt, one of the companies contributing to human-computer augmentations. Grey asks Asha to help him return a refurbished car to his client Eron Keen, a renowned tech innovator. While visiting his home, Eron reveals his latest creation, a chip called STEM that can manage a human's motor functions." https://en.wikipedia.org/wiki/Upgrade_(film)#Plot
The 2014 Intelligence_TV_series had a fascinating premise.
"Gabriel Vaughn is a high-tech intelligence operative enhanced with a super-computer microchip in his brain. With this implant, Gabriel is the first human ever to be connected directly into the globalized information grid. He can get into any of its data centers and access key intel files..." https://en.wikipedia.org/wiki/Intelligence_(American_TV_series)#Plot