Bofoi/Synopsis

History
'''The following section contains Webcomic spoilers. You have been warned manga-only readers.''' Sometime prior to the original storyline, Child Emperor worked as Metal Knight's assistant.

Giant Meteor Arc
Bofoi arrives just as Genos prepares to take on the giant meteor and Genos recognizes Bofoi. Genos introduces himself and asks Bofoi for his help, but Bofoi refuses, stating that he is only there to test out a new weapon, and that he would prefer to be called Metal Knight, as it is courtesy to call a hero by his real name. He then reveals that he isn't even in Z-City, but is instead using a remote controlled robot from a safe distance away. As Genos then runs off to a better place to stop the meteor, Bofoi fires a volley of large missiles which converge on the meteor and cause a massive explosion. This, unfortunately, is not enough to stop the meteor which bursts through the cloud of smoke cause by the explosion much to both Genos and Bofoi's surprise.

Alien Conquerors Arc
After Boros's defeat and the fall of the Dark Matter Thieves' spaceship, Bofoi, through one of his robots, appear in the ruins of A-City to collect the remains of the spaceship. Genos then confront him asking what he will do with it, and Bofoi answers that he will use their technology to make new powerful weapons, that are needed for the sake of peace. It is also revealed that Genos and Bofoi may have a connection, as Drive Knight tells Genos that Bofoi is his "enemy".

Monster Raid Arc
While Elder Centipede wrecks havoc to S-City, Bofoi arrives and attacks Elder Centipede. Despite his powerful set of missiles, Elder Centipede only gets annoyed. Bofoi see this as an opportunity to collect Elder Centipede skin after his defeat to build more weapons. He then tells the Mohican and Pineapple to leave because of the potential destruction his weapons can cause.

After successfully capturing the child of a sponsor, Elder Centipede took Phoenix Man and Rhino Wrestler and proceeded to retreat underground. Shocked by Elder Centipede's retreat, Metal Knight gave chase, persistent not to lose his target. He successfully grabbed onto Elder Centipede as they disappeared underground.

Super Fight Arc
At some point, through unknown means, Bofoi's robot was severely damaged and captured at Monster Association's Headquarter, and its broken pieces are hung in chains.

Despite the damage, it is still operational and is apparently being used by Bofoi to spy on Orochi and Gyoro Gyoro. Through his robot Bofoi questions Orochi and Gyoro Gyoro about their goals and while they tell him destruction is a natural part of a monster's instincts, it is not their end goal.

Psychic Sisters Arc
After Caped Baldy makes his way into the A Rank of the Hero association. Dr. Bofoi takes an interest in him after a security system installed for the new HQ he had constructed using the invaders ship, was dismantled by the former single handed.

While looking over the video surveillance Bofoi decides to study Saitama's superhero registration entry. Looking into his hero activity he finds nothing of interest other than his sharp rise in the ranks over the course of three months, yet notices, while viewing the security footage, that the defense robots he designed were made to take down Demon level threats; and for him to have so easily taken them apart implicates his power being either at or greater than S class.

Fall of the Hero Association Arc
After the fiasco concerning Fubuki, Tatsumaki and Caped Baldy resulted in the destruction of the new superhero base and the escape of all the Mysterious Beings incarcerated in its basement. Bofoi gains a grudge against Saitama when the incident caused had unintentionally ruined Bofoi's reputation with his contractors.