I'm only allowed to pick three tags, but Eric is able to hit a lot of boxes - he consistently has planned content that reflects each player/character's goals, but is also able to wrap in changes as characters are explored and their reactions shape the world. Eric is excellent with differentiating NPCs through voice and character choices. For players considering joining one of Eric's games, my biggest recommendation is to let him know where you want your character to go, whether that be growth or challenges, because he will find ways to work those bits of feedback into the story, and it will feel very cohesive and fleshed out. But the more you give back, the more he's able to do!