G4 is a self-proclaimed "Machine God" built by the same organization that Hammerhead stole his armor from. His goal was to force "The World's Strongest Man" King to fight him in order to test his abilities. Being far to terrified to face him however, King runs away, leaving S-Class cyborg Genos to fight the Machine God instead.
Powers and Stats
Tier: At least 7-B
Origin: One Punch Man
Gender: Genderless, referred to as male
Classification: Robot, "Machine God," Demon Level Threat
Attack Potency: At least City level (Genos considered G4 to be at least a Demon Level Threat and had an extremely hard time defeating him, with G4 even taking his arm off in the process. His parts were also responsible for a big upgrade Genos got later on)
Lifting Strength: Unknown. At least Superhuman (Wields a nearly 5 and a half meter sword with ease)
Striking Strength: At least City Class (Scaling from Genos)
Durability: At least City level (Tanked several of Genos's attacks)
Range: Extended melee range (Due to his sheer size), tens of meters with laser beams
Standard Equipment: The G Blade (A massive sword almost 3 times as tall as a human and twice as wide), his upper layer of armor, back thrusters which help him fly and keep balance.
Weaknesses: G4 is extremely arrogant (Thought he could defeat the strongest man on Earth) and willing to fight anyone in order to test his abilities. His false form also has low resistance against heat.