replayed the war within and decided to make this first post with bits of lore finally.
Exis, The Operator.
Was born to become Dax, but ended up on Zariman - punishment for his family in a wrap of glorious honor. Did not lost his family on Zariman, in fact he lost them long before, but until the end did his best to keep his traditional ways of living but alas. Golden lords happened to be rotten. As Void erased any restrictions upon him so he became killer of Orokin when it was the time to destroy Empire with no hesitation.
His heart was renewed by Truth, he probably was from group of tenno who were in touch with Kullervo, and last but not least he decided to abandon his duty and ways of life deliberately. He had his own reasons for his own rebellion, his own judgment.
Now he belongs to Arbiters of Hexis and he is the one to keep balance between every existing fraction, the last decider, by rule of power. He knows that he is strong in a godlike way and he does his best to contain that power and use it only when necessary. He knows better than anyone that any thought about his supremacy will bring him nowhere but to the path of lies and mortal mistakes. He is not wisest or smartest, but he is fair, strict and mostly So. Fucking. Tired.
With Man in the Wall he has something like paritas, but he is on Albrecht's side. Again, by choice. Drifter for him is some kind of spare eyes and hands, not usually effective, but reliable.
Random facts - Exis is for Existence, and we share birthday because I played second dream at my birthday. Also he knows how to fight even without void's powers.