You could just not mention AI at all. Imagine that.

I don't work, but the same is still true for me. Everything I do during the day feels off, and when it starts to get dark, that's when everything starts to feel right.

When the world is winding down or going to sleep, that's when I wake up.

League of Legends, yes. The demon looking thing is part of a semi-race (complicated) of beings that were sealed into weapons, becoming the weapons themselves. They try to persuade people to pick them up, after which they take over their body and reshape it closer to how they once looked.

The guy with the braid grabbed a weapon like that, but could resist the weapon's influence. So now they're constantly fighting for control over the guy's body, with the demon thing always looking for moments of weakness where he can destroy the other guy's mind, effectively erasing him.

They can converse, and of course, it's funny if they squabble in-game, but they're literally mortal enemies.

They ain't friends, though. But it's still nicely done.