Dr. Neil Agastran, antagonist of my Doctor Who-Concept-That-Actually-Has-the-Doctor. He's not a mustache twirling villain laughing atop his throne of skulls. He's rather a dedicated surgeon whose aim to help people is tested in the wrong way. Living during the time of the Human-Dalek wars, his test subjects are live Daleks, delivered to him by bounty hunters. He knows Daleks to be incredibly easy to manipulate, and is affirmative in his belief that he is completely justified in using them; even his benefactors believe so. Through his research, Dr. Agastran was able to accomplish feats like never before. He perfected organ cloning and cybernetic limbs; he brought embryonic adoptions into existence (that being the transfer of a first-term pregnancy from one woman to another); Finally, he developed gender transition surgeries to a point so perfect that a trans woman could become pregnant if she so chose (and a trans man could impregnate).
Dr. Agastran's son, Neil Junior is hesitant about using captured Daleks as test subjects. He believes it to be immoral, but struggles to understand why he believes so. Unable to sway his father, Neil Junior ensures that, at the most, mistreatment is not occurring and takes on poor recoveries on his own. Most of all, Neil Junior favors working more with medicine than with surgery, and uses plants in his personal research. While Neil Junior absolutely supports his father's patients, he rejects the means used to help them, and feels a touch of shame.
Of course the Doctor comes along, and is really happy with Dr. Agastran's work (nearly reaching the point of becoming a fanboy), until he realizes that Daleks were used to test the accomplishments. And then he's pissed for more reasons than one. It might be a bit of a game to count all the reasons why he'd be mad. The whole arch is about the Doctor trying to convince Dr. Agastran to find another way to continue being the best of humanity...without having to sacrifice it at the same time.
Junior's design, and thus Dr. Agastran's design, is mostly inspired by my ex
. I dunno, I just imagine Junior looking kinda like him.