In Hindu mythology, Vishu the preserver manifests whenever evil overtakes the world, to destroy the wicked and wickedness, so that the good may take over. There are 10 avatars or forms that he takes, one following the other, to do this. And this is an endless cycle.
While is no complete agreement on all 10 avatars, there is no doubt on who the last one is. Kalki, the rider of the white horse.
Kalki avatar, it is said, will manifest at a time when the world is in a crisis because of a wicked and tyrannical ruler. The coming of Kalki will lead to the destruction of evil and the earth will be rid of its suffering and sorrow. Kalki will rejuvenate existence by ending the darkest and most destructive period and usher in the Satya Yuga (Era of Truth).
Shiva is said to have given Kalki a sword and said : ‘I give you this sharp, strong sword and so please accept it. The handle of this sword is bedecked with jewels, and it is extremely powerful. The sword will help You to reduce the heavy burden of the earth.’
Does George RR Martin–or Weiss and Benioff considering we are referring to the last season of GOT–have any interest in/acquaintance with Hindu mythology?
If they did, I would say that Arya shows shades of Kalki! The Seven Kingdoms seem to be at the peak of wickedness. There is a going-off-the-rails ruler waiting to take over from a positively wicked one. So the time is right for an avatar. Arya now seems to be shunning violence. She seems to be in a phase where she may well make it her mission to destroy evil and restore good.
Like Kalki, her chosen weapon is a sword, given to her by a preceptor, Jon.
And the biggest sign of all– she now rides a white horse!
And more than anything else, should not the saviour, for once, be a woman! It will be good for at least one avatar to be a woman! And it will help GOT, which is being criticized for bringing down all strong women, or the good in strong women, in its last season.
So one more theory to add to the flurry of theories which are inundating us from all sides—Arya as Kalki!