Luna
(Nadia Hilker)

This Nightblood and leader of the Boat People was last seen refusing to help Clarke defeat A.L.I.E. and also refusing to become the new commander of the Grounders. We don’t yet know if she’ll come into play in season 4, but the trailer showed another woman — one who is not Luna — seemingly picking up a chip and placing it to her forehead.

So maybe there’s a new potential leader in town? But it would be a shame if we never hear from or see Luna again.