Ehh it could work on local hardware in some future.
And for example in GTA 5 there are already mods that give LLMs a body to speak through.

Can't find the video in my history but it was about having a comlanion NPC you could converse with (voice chat), drop weapons to use for a robbery, plan the getaway with.

(And tbh considering how braindead some players can be, LLMs won't be the most uncapable to control a character)