I have a friend whose favorite part of RPGs is building worlds and exploring what is possible and seeing what stories the characters have to tell. So I’m looking for good games with little-to-no crunch and, if there is a setting, it’s broadly defined with a lot of space for players to fill in the details. Games that come to mind are Ben Robbins’ Microscope or Kingdom, maybe Fiasco or Primetime Adventures? I know she’s played Monsterhearts and liked it.
Actually, now that I think about it, a lot of low-crunch games focus on collaborating storytelling and world-building, so feel free to name your favorites and why you like them.