Board Thread:Theories and Speculation/@comment-33005792-20170901151707/@comment-734582-20170902075522

Elveonora wrote: In my opinion, Kara is an anti-Otsutsuki group that formed long ago in order to prevent their arrival and plans to claim the Earth. Your theory is promising, though i think there's something that needs to be said: There's no actual reason to believe that the Otsutsuki race consists solely and uniquely of the Otsutsuki clan. It could be other members of this species that formed Kara against the Otsutsuki.

However, yes, it seems likely that Kara exists to fight against the Otsutsuki homeworld.