Here's my template. Feel free to cook up your own!
Dr. George Matheson
A child prodigy, George Matheson earned his first PhD in neurobiology before he turned twenty-one. He continued to excel in other scientific fields, most notably virology, before an advanced IQ test he undertook in 2009 displayed his intellect at approximately 198.
During the initial walker outbreak, Dr. Matheson was one of the top ten consultants employed by the CDC to coordinate the search for a possible vaccine, and failing that, a carefully engineered contagion that would wipe out the walker population entirely. But as government collapsed, Matheson quietly slipped out of Washington DC, establishing his own base of operations at St. Neville, a vast hospital complex.
Matheson has an obsession with the subject of death, long before the dead started walking the Earth, and unlike the rest of humanity, who see the walkers as the heralds of Mankind's extinction, Matheson believes they are a "failed prototype" for a new stage in human evolution, a theory he seeks to prove by "rehabilitating" every walker he can get his hands on.
When first encountered by the PC, Matheson has transformed St. Neville into a veritable fortress with the help of a ragtag group of former medical staff and military personnel he scraped together over the years following the walker epidemic. Matheson has been conducting complex neurological experiments on various walkers he's captured from the surrounding countryside, and the PC's group soon discovers, much to their shock, that Matheson has accomplished the impossible: He has restored several dozen walkers to a state of semi-cognizance. Most of these walkers now act as makeshift guards and menial workers in different sections of St. Neville. Matheson's prime subject was Helena Matheson, his daughter, who was bitten during the first days of the zombie apocalypse.
The PC eventually learns that Matheson has no real love for his daughter; he is, in fact, a high-functioning sociopath, and his inability to make sense of human emotions, ironically, allowed Matheson to keep a cool head while the rest of the world went mad. Matheson is aware of his mental condition and acknowledges it outright, stating that lacking a traditional human conscience has become a genuine advantage thanks to "the recent turn of events". Matheson also believes he couldn't have made his breakthroughs if he had been impeded by a pre-apocalypse set of ethics. His surviving colleagues have secretly compared his work to the actions of Josef Mengele and Unit 731, although they are too much in awe of Matheson's genius to challenge him publicly.
In stark contrast to the Governor and Negan, who alternate between brute force and primal laws to keep their "followers" in check, Matheson is a pure intellectual who sees himself as a kind of pioneer. For the first time in history, Mankind has been given concrete evidence of existence after death, and Matheson is mystified that no one else seems to be trying to exploit "this miraculous opportunity". He is the last, best hope for the world...and he is also a complete monster.
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