Here's my write-up for Brax which I did a couple of years ago - I've updated it with one or two of the more recent traits. Note that Brax isn't balanced as a player character (I rally don't think that could be done - he's too powerful), so he's statted as an NPC.
IRVING BRAXIATEL First appearance: Theatre of War (Virgin Books)
SPOILER WARNING: The following includes major spoilers for many of the stories featuring Irving Braxiatel, in particular the Virgin novel Tears of the Oracle and the following Big Finish audios: the Gallifrey series, Death and the Daleks, The Mirror Effect, The Crystal of Cantus, The End of the World, Resurrecting the Past, Escaping the Future and others. "I'm not manipulating you, Benny. You're my best friend."
Irving Braxiatel, usually called Braxiatel or Brax for short, first appeared in the Virgin New Adventures novels and went on to become a major character in the Professor Bernice Summerfield series. He is a Time Lord exile and owner of the Braxiatel Collection, a vast collection of art and artefacts from across time and space. The Collection is based on KS-159, an asteroid in an area of unclaimed space close to the Draconian Empire and which Braxiatel won in a game of cards – though if it had been for sale, he would probably have been able to purchase it using his seemingly limitless wealth.
Before leaving Gallifrey, Braxiatel had been a highly skilled politician. He was a Cardinal, then briefly Chancellor and then Lord President. However, he had been secretly meeting with his past and future selves in violation of the First Law of Time in order to acquire items for the Collection. The Collection is an obsession that has defined Brax’s life, as he wants to acquire as many items as possible to save them from possible loss or destruction. During the Pandora crisis on Gallifrey, Braxiatel used his own mind to contain Pandora – an evil entity from ancient Time Lord history - which meant that he could never again link to the Matrix or any other Time Lord mind for fear of passing on the Pandora infection. He therefore exiled himself from Gallifrey.
The Braxiatel Collection on asteroid KS-159 is located in the late 26th and early 27th Centuries, and has included Benny Summerfield and her semi-estranged husband Jason Kane among its employees. Braxiatel had apparently acquired the asteroid as his position as a Time Lord allowed him to see that its place in time and space was one safe from invasion. However, after the Daleks were able to attack the asteroid, changing the timelines because of their time travel technology, Braxiatel realised that other methods were needed to protect his Collection. He therefore located a Cyberman colony world, Cantus, and used Gallifreyan technology (and an unwilling human as the new CyberController) to place all the hibernating Cybermen under his control, providing him with a sleeping army should the need arise.
Jason Kane became suspicious of Braxiatel’s activities, but Brax used his hypnotic powers to wipe the memories of the suspicions from Jason’s mind and to use him as his unwitting agent. When Jason recovered his memories and realised that Braxiatel had been altering the timelines of all those around him, Brax manipulated Benny’s son Peter into killing him. Benny subsequently discovered Brax’s Cyber-army and realised the truth. Braxiatel initially went on the run, but eventually (and reluctantly) returned to the Collection – though only as a resident, not its leader. Behind the scenes though, he was still manipulating others and so retained a measure of control by proxy.
The true reason for Braxiatel acquiring asteroid KS-159 was revealed to be its proximity to a powerful temporal schism, whose energies he could siphon and use for his own purposes. When he became aware of the Deindum, a reptilian species from the future whose power could rival the Time Lords, he used the schism first to try to prevent their creation, and when that failed, to prevent them becoming so powerful and aggressive. When this backfired and resulted in the Deindum actually becoming more aggressive, he and Benny joined forces against them. At the climax, Braxiatel was shot by a Deindum soldier and died. Or did he...?
It has been strongly implied, but not conclusively stated, that Braxiatel is the older brother of the Doctor. Brax is suave and well-spoken, with a cool formal manner at all times – though he is not without a dry sense of humour. In all incarnations so far seen, he appears to be a tall, slim man somewhere in his forties, with dark neatly-trimmed hair. He typically wears sharp business suits with a crisp white shirt, gold cufflinks and a sober tie. Brax’s mind is renowned to be labyrinthine and he is always several steps ahead of the opposition, devising plans within plans within plans. As an adversary, he is formidable as he is almost impossible to out-think and has virtually unlimited resources, owning various companies, fleets of ships, untold numbers of priceless antiques, works of art and technological devices, and even a few planets. Even if he appears to be defeated or dead, the reality could actually be somewhat different. Although Irving Braxiatel ultimately turned out to be one of the villains (or an anti-hero at best), for the majority of his appearances he was on the side of the good guys, even if it was to further his own schemes.
TRAITS: Adversary (Major): The Fifth Axis; the Daleks; the Deindum; various others. Boffin (Major): Brax can use the fine art of jiggery-pokery to build or repair gadgets. Charming (Minor): His smooth manner gives him a +2 bonus to charm others. Dark Secret (Major): Brax secretly manipulates all those around him, usually very subtly but he is not above using mind control (as with Jason), murder (again, with Jason) or even genocide (for example, during the Draconians-Mim War, a war which Brax had in fact instigated) in order to achieve his goals. Distinctive (Minor): Braxiatel’s formal manner and his sharp dress sense make him stand out: -2 to go unnoticed, +2 to be remembered. Epicurean Tastes (Minor): Brax enjoys the finer things in life. Feel the Turn of the Universe (Special) Hypnosis (Major): Braxiatel is able to exert mental control over others, including the ability to adjust their memories and plant post-hypnotic commands. Indomitable (Major): Brax has a +4 bonus to resist psychic attacks, hypnosis and the like. Obsession (Major): The Braxiatel Collection is his obsession and he will protect it at all costs. Outcast (Minor): Because he still has a fragment of the Pandora entity in his mind, Braxiatel can never return to Gallifrey. Tailored Regeneration (Major): Brax always takes the same appearance. Technically Adept (Minor): Brax has a +2 bonus to use or repair gadgets and equipment. Time Lord (Special) Time Lord - Experienced (Special): Actually it’s unknown which incarnation Braxiatel has reached, but he has lived for several centuries at least. Time Traveller (Special): Brax has no penalty for working with technology outside his own time period. Voice of Authority (Minor): Braxiatel has a +2 bonus on Presence and Convince rolls. Vortex (Special) Wealthy (Major): Brax is stinking rich and never has to worry about money!