Microchip

Microchip, or David Linus Lieberman as was his true name, was a former weapons engineer. He was also especially skilled in the use of computers and technology. He became the Punisher's sidekick for a long duration in the start of the Punisher's career.

Originally Microchip was the guy that the Punisher would go to for new equipment and vans. However, after the death of his son he joins Frank Castle in his war on crime. In order to find and take down the Kingpin for the murder of his nephew, who was following in his steps as a hacker, David Linus Lieberman joined the Punisher in his fight against crime. Microchip's skills are not limited to hacking, he is also an experienced cyber-investigator, can launder money, find hard to get ammunition and weaponry and training Castle in more specialized areas needed for missions.