Violence Jack

Violence Jack is a horror manga series by Go Nagai, it is known for having several serializations and one-shots (making it Nagai's longest running series) in addition to the intense violence and appearances from his other characters. The series is focused on Earth after going through a catastrophe that lead to Tokyo being disconnected from the rest of Japan and the world torn apart in a survival of the fittest style. Within the chaos is a large amnesic man known only as Violence Jack. Jack gained his name for the violence that he gets himself and others into and the giant jacknife he wields. The original manga later reveals the world to be a remade version of Earth by God as punishment for Satan for his actions in Devilman. Jack and his extensions of power are later revealed to be the body and will of Devilman who manages to defeat Satan by regaining his original form. Subsequent manga tended to ignore this plot twist and have Jack as his own person, however it is still considered by many to be a mainstream part of the Devilman franchise which it isn't.

Mazinger Influence

Kenzo Kabuto with Dr. Hell's heart.

Several characters from the Mazinger franchise appear in Violence Jack including a human version of Mazinger Z named Jim Mazinger and Koji Kabuto as a child. They also have a story arc dedicated to them called Castle of Iron in the form of a karate training genre along with other characters from the series like Sayaka, Boss, Aphrodite A as a woman with an Afro, Diana as a part African woman with blonde hair, and even Kenzo Kabuto. The main conflict turf war between these characters and Count Brocken before they face off against the second generation Kikaido Karate user, Dr. Hell who had assassinated Juzo Kabuto.

Aila Mu from God Mazinger appears as a semi-recurring character, appearing as a model who recently became leader of a community of women that were under pressure by two other communities. They get help from Jack to escape from the underground.

Tetsuya and Jun were also featured as major characters. Tetsuya is killed by the biker gang Hell's Wind after they topple hiscar prior to the coming tragedy. Jun (bearing her TV Magazine manga appearance) survives the ordeal and vows to hunt down the biker gang to avenge Tetsuya, coming into contact with Jack.

Violence Jack in Mazinger

The Kurogane House features characters from Gakuen Taikutsu that play a large role in Violence Jack. Tsubasa Nishikiori is among them, who later appears in Shin Mazinger Shogeki! Z Hen as the mother of Koji and Shiro Kabuto and a former collaborator of Dr. Hell.

The Mazinkaiser SKL OVA features a plot similar to the Evil Town arc of Violence Jack, three armies that want dominance over each other (one even being lead by Aila) and the SKL's role taking a parallel to Jack.