phantasmalrift would seem to hit most of the right notes? It's a comm-based sci-fi exploration game with a focus on power building and plenty of room for developing CR. The game has a relaxed atmosphere, very backtag friendly, and AC is super light, requiring a simple 5 comments per month. It's handled entirely by the mods, too! Points earned through activity can be used to buy items and even new abilities for your character.
The story is that characters are accidentally brought to the game's world by falling through cracks in reality called "Fissures". From the Keystone Research Station, they set out to explore and stabilize the Fissures in the form of dungeons, and in doing so learn more about them and ultimately use that knowledge to find a way home.
As for castmates, I play an alternate version of female Robin alongside her male counterpart, from an AU where they're twins. It hardly needs saying that we would absolutely love to have either Chrom or Lucina!
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The story is that characters are accidentally brought to the game's world by falling through cracks in reality called "Fissures". From the Keystone Research Station, they set out to explore and stabilize the Fissures in the form of dungeons, and in doing so learn more about them and ultimately use that knowledge to find a way home.
As for castmates, I play an alternate version of female Robin alongside her male counterpart, from an AU where they're twins. It hardly needs saying that we would absolutely love to have either Chrom or Lucina!