I don't see an option to open a new topic, so I just put my idea here if you don't mind. The name of this topic is general enough.

What do you think about people joining our game temporarily as enemies?
I mean there could be a setting in the menu to allow "guest enemies" to request joining and for example random people from the community could join our game, however not as a companions, but they would replace the AI in a battle? So not like an arena, but like a guest during our story progression in a normal battle. Sure, some people would try to cheat and make the combat easier for themselves, but it is their loss.
There could be a rating system to avoid unserious people who could ruin the experience for the player. And there could be a timeout to avoid too slow battles.
I just had a sort of flashback that it could be fun to see a name appear in the middle of the battle next to an enemy and *boom* it is one of our fellow community members! It could spice up the battles...
What do you think? Does something similar already exist in another game?