Yuri

Intro she is a mad crazy the doctor/scientist and in a group of four of scientists and doctors that have been rejected and outcasts for their ways of doing certain things of from torturing their patients to our using it them as experiments in Lab rats and using illegal stuff to do their operations in their priority goal is to create some kind of superhuman one that could not die from anything or at least be immortal somehow unable to die from disease attacks or even internal injuries and somehow regenerate from all damage including dangerous diseases like cancer and even regenerate brain matter but there are ways of doing it is extreme (you can think of your own story)