The Justicar

To humans in the mid 26th century, the Nix Novaslayer known as the Justicar claims to have been "practicing the art of war since you first learned to split the atom" making her at least 600 years old, probably 700 or more given the long juvenile period (60+years) of the Nix species. She has taken the Nix natural metaphysical skills and honed both them and her body and mind into a devastating killing machine. Earning her name first as a mercenary and then as a champion gladiator, at some point she was initiated into an ancient interstellar fraternal organization known as the Novaslayers (a human corruption of their actual name which they find amusing). The Novaslayers believe that all actions should be self-serving, even if one allies with others, it is because they intend to get something out of it...even if its their own safety in the future. Many Novaslayers are...well...jerks. But the Justicar appears to stretch the philosophy at times, believing that the safer the galaxy, the better it is for her as she enters her later years. She also believes that the experience of battle makes one grow, and thus conflict with challenging enemies makes her better, and ultimately more prosperous for having defeated them (and looting their ships and corpses pays off too). She rarely travels or fights now, having amassed an untold fortune. She mostly rules as the referee over the gladitorial duels set up on Merc World by Vorga, a Fahreen crimelord. She is only roused to battle by incidents of cosmic importance, though some say she uses the arena as a means of scouting for potential future Novaslayers...at least three champions since she has been refereeing have joined the organization.
Vorga, though powerful in his own right, refuses to call her on it. She is probably one of the few beings he actually fears, though he has the resources to overwhelm her he doubts that any of them could stop her from killing him if she really wanted to.