Origin
During an investigation into Kingpin, Daredevil got help from an Inhuman known as Reader. Reader has the ability to make what he reads real, and while reading some of Murdock’s notes, he fell asleep during the part recounting Murdock’s time undercover as a fictitious twin brother, Mike. This caused a real Mike Murdock to manifest as something Reader refers to as a fragment.
Creation
Mike Murdock debuted as a real person in Daredevil #606 by writer Charles Soule and artist Phil Noto. He is based on a previous undercover identity that Matt Murdock used starting in Daredevil #25.
Major Story Arcs
Fragment
When Matt first came across Mike, he knocked him unconscious and brought him to a library to confer with Nur and Reader. Reader knew exactly what he was, explaining his origins to the others. Reader seemed to not be that worried about it. He had a way of erasing fragments. However, Mike woke up as they were talking about ending his “life” and acted out of desperation. He took Reader’s dog and held it at gunpoint with Nur’s gun, allowing him to escape.
Scared for his life, he went searching for his brother, not knowing that he and Daredevil were the same person. Desperate, he held Foggy Nelson at gunpoint and forced him to call Matt but got mad when Daredevil showed up. He demanded Daredevil set up a meeting with Matt and took Foggy as his hostage. So, Daredevil changed into his Murdock clothes and met them in the park. They discussed Mike’s new reality, and Matt was convinced that he was real now and deserved to live. Unfortunately, the appearance of Reader spooked Mike into running away.
Still desperate, Mike tries to parlay favor with Kingpin (as mayor of NYC). He informs Fisk of Daredevil’s investigation into his election. He was hoping to get a job and some security out of it, but Fisk pretended to reject him. Instead, Fisk had The Hood reach out to Mike for an opportunity.
One More Day
While working for The Hood, Mike stole a Norn Stone from his vault and hired Black Cat to steal some translated Asgardian spells. He used them in tandem to rewrite history and turn him into a real person.
In this new history, Jack Murdock raised twins given to him by the nuns. Mike grew up saving Matt from bullies while his father tried to teach him not to take the bait. When Matt lost his sight saving a man crossing the street, Mike took it badly, but Mike was the only one to see their mother, Maggie, come visit him in the hospital. While Matt hit the books, Mike hit the streets growing up into a grifter and a scrapper. This disappointed Jack, and the two had a falling out. Matt was still able to convince him to come cheer on their dad at the fight that would eventually leave him dead.
With this new history flooding his brain, Mike woke up in his apartment to some strong emotions. He was approached by Daredevil, who was planning on pleading guilty to manslaughter charges, who told him The Hood was gunning for him. Mike refused to leave Hell’s Kitchen though. After Daredevil left, Mike caught up with his old friend Butch Pharris and plan what their next move was.
Undercover as Matt Murdock
While Matt was standing trial as Daredevil, they needed a stand-in for Matt Murdock, so Foggy hired Mike to do it. Mike still doesn’t know Matt is Daredevil and was told by Foggy that Matt was in rehab. Meanwhile, Mike is collaborating with Butch to slowly but surely take over the criminal enterprise of Izzy Libris and become the new Kingpins of NYC.