The Rampaging Cyborg

The Mad Cyborg is the Cyborg that destroyed the home town of Genos, murdering his family.

Appearance
Not much of the mad cyborg is seen, but an image from Drive Knight is shown from behind. It looks robotic and has 5 spikes going down it's back.

History
15 years before Genos met Saitama for the first time, the Mad Cyborg destroyed his home town, killing everyone including his family. Genos was the only known survivor. Dr. Kuseno had been tracking it down, he came to the destroyed town and met Genos.

It is said that around 15 years, the same time Genos had his encounter with the mad cyborg, Drive Knight has had a similar past, where it destroyed his home town also. Drive Knight tells Genos that he is a creation made by Bofoi.

Neo Heroes Uprising Arc
After Drive Knight tolled his history about the mad cyborg to Genos, it is revealed no hero records have been shown to take down the Mad Cyborg and it has not shown up for a few years. It's theorised that it is most likely in sleep mode, hidden away with the rest of Bofoi's robotic creations.