Background
As a youngling on the Outer Rim world of Toola, Krios was recruited by the Jedi into the Hawkbat clan. Krios' predilection for first strikes and a strong offense settled most conflicts quickly, if not exactly fairly. Her Jedi Master saw these as promising tactics in a Padawan and honed them under the Ataru form of lightsaber combat.
Now as a Jedi Knight, Krios hunts irredeemable dark force users. Her job is an unfortunate necessity towards balance, but her devotion to her homeworld's faith and the Jedi code reconcile her deep spirituality with her violent profession, absolving her of any conflict of conscience.
Krios currently works with a bounty hunter partner with similar goals. They met when they were both after the same target and teamed up for the challenging take down. Their combined tactics and camaraderie inspired them to partner up.
Motivation
Faith in a religious code