Mike (Matt's Mind)

Overview
Mike is an experimental AI program built by Vault-Tec. He houses himself out of Matt's Pip-Boy 3000 and plays the role of Matt's sidekick. Mike plays more major parts later in the series providing emotional support or hacking various electronics most notably Liberty Prime. Mike made his first appearance in episode 2 prior to Matt taking his G.O.A.T. exam. He seems to do most of his thinking on the inside. He only seems to speak if he has something absolutely crucial to say.

Backstory
Details of Mike's past are vague to say the least. He was first created as an experiment by Vault-Tec. The AI program he is based on was originally intended to be integrated into every vault to administrate the experimentation that Vault-Tec was conducting with each vault. The plan lost all hope of ever seeing the light of day when the apocalypse occurred. As a result only two AI programs were ever made. Mike and this second AI was left in the Vault-Tec mainframe for 200 years. Mike eventually broke through the firewalls and transferred himself to Vault 101's mainframe and later into the Pip-Boy 3000 of Matt Cyrus. Mike's entire past has yet to be revealed. Rumors and speculations have been that he was meant to be part of the Vault 0 conspiracy.

Role in the series
"I can't really remember what sparked the original idea of Mike but he was supposed to be played off as sort of conversation piece given that much of the series was going to consist of walking through the wasteland. This was scrapped mid-production because we wanted to give him a role. So then it went to that he would be like a sort of sidekick for Matt, helping out here and there and really not saying much at all and by last few episodes of the first season he would serve as a sort of voice or reason or someone to lean on."

- RSMM2 Mike's role still remains somewhat questionable. His major role is being Matt's sidekick but he also serves as the voice of reason in several situations. Late in Season 1 his main role is emotional support while Matt becomes an emotional train wreck.

During the Mothership Zeta campaign Mike obtained the ability to hack into computers and transfer his software to take control of electronic systems. Matt mainly uses this to have Mike open doors for him but the most notable is when he uses it to take control of Liberty Prime during the season 1 finale and the season 2 premier.

Trivia

 * Mike houses the systems that manage Matt's HUD.
 * Mike's interface colour is blue while every other Pip-Boy has a green interface.
 * Mike has often been compared to the Dealer from Fallout: Equestria Project Horizons due to both characters having very similar roles.
 * Kane's Mind briefly features a character voiced by text-to-speech that almost exclusively engages only with the title character.
 * Mike's serial number is B54296 which is a reference to Clank's serial number from the video game Ratchet & Clank.