Something I noticed about Path of Radiance is that Ashnard, despite nobody who isn't Ike/a Laguz Royal/a Dragon being able to hurt him, has pre-battle dialogue with tons of people. He even has one with Reyson, a unit who not only can't hurt him but can't attack period and will likely die in one hit. The developers wouldn't need to put this much effort into a final boss who only a small group of units can do anything against, but I've always appreciated it, for flavour if nothing else.
Are there any "developer going the extra mile" things you like?