In a parallel universe, Mr. Bartholomew’s experiments resulted in him gaining the ability to create light constructs with none of the negative side effects experienced in the primary universe. He became a superhero known as Blacklight. He’s not nearly as famous as he is in Universe A, but everyone’s a lot happier with him.
After the incident I just mentioned, Mr. Bartholomew attempted to continue his research, using himself as a test subject when necessary. As a result, he gained super-strength and mild regenerative healing abilities; unfortunately, these abilities came with increased aggression and paranoid delusions. He believed himself to be the one true savior for all the mundane people and would make them see it by any means necessary. He adopted the iconography of the Illuminati for his belief system.
The Chin is sometimes known as Illuman. That is canon you did not know before
Seriously speaking, his real name is Edward Bartholomew! He began his descent as a mild-mannered but highly intelligent doctor. He was a member of a research facility looking into superhuman abilities for medicinal application (for instance, super-strength to cure muscular dystrophy) and that was all well and good for a while. However, one of his colleague’s experiments went horribly wrong and everyone involved in it suffered massive radiation poisoning. There was a lot of negative media attention, and one particularly nosy reporter found that another colleague was doing some pretty unethical gene splicing procedures.
Funding got pulled and Bartholomew lost his position. Things only continued to go downhill from there, but that story’s for another time.