Metal Knight Unit

The Metal Knight Unit (メタルナイトの機体, Metaru Naito no Kitai) is a drone robot made by Bofoi. It is his primary and favorite machine which he uses in combat.

Appearance
It is a large silver-colored robot with multiple cannons attached to its back. It has a distinct set of three circular marks on its "face."

Giant Meteor Arc
It is first shown when Bofoi was testing its weapons against a colossal meteorite. The robot fires a volley of large missiles that 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 caused by the explosion much to both Genos and Bofoi's surprise.

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 sees this as an opportunity to collect Elder Centipede skin after his defeat to build more weapons.

Super Fight Arc
At some point, the robot was severely damaged by Orochi and was 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.

Abilities and Powers
Bofoi is capable of communicating through this robot, and linking his other robots to it to gather data and improve battle efficiency.
 * Flight: Bofoi's battle robot is shown to be capable of flight. This is due to the multiple jet propellers incorporated in its design.
 * Missiles: Bofoi's battle robot is shown to be able to fire off massive volleys of large, powerful missiles. They are noted by Genos to possess great destructive power.
 * Suction Pads: The battle robot possesses multiple suction pads inside its body, which it can extend out to cling onto something. Bofoi first used them on Elder Centipede, when the latter retreated with its comrades.
 * Durability: The strengths and limits of the Battle Robot's defensiveness and durability have so far not been shown. However, when Bofoi was explaining his encounter with the Monster King, he placed an emphasis on the fact the Monster King was able to penetrate through the robot's hands and body in a single strike. This can suggest that the Battle Robot has considerably strong durability.