Well let's talk about what the game shouldn't have first. And this will probably be updated.
Voice overs- There shouldn't be full voices for characters, but more like Hah! Hyut! Hnf! Hmm? etc. If you intend to have full cutscenes that aren't in game but are animated or drawn out then I would suggest having a storytelling like narration.
Bland villages- There needs to be life in the villages, even if there aren't many players around. I'd recommend at least a person per house and a families for most of them. Have people walking around town, talking to each other, have some too busy to speak to you. They might be on duty or whatever. Children could play catch or tag etc. Adults could do any number of jobs from postman work, to getting water from a well and taking it back home, to guarding. Inside of taverns there should be dancing and maybe have tavern only music that plays to simulate the bards' instruments.
2 heights of people- I notice that most games tend to have characters who are either Adults or kids but no inbetween. I wouldn't make this mistake were I you. While age isn't necessarily known, it would help to have Children sized, adolescent sized, and adult sized characters to build a realistic world.
