Great Mazinger

A short manga version of the UFO Robo Grendizer anime. Released along the anime series, UFO Robot Grendizer follows the adventures of Duke Fleed, the Prince of Planet Fleed, whom disguised as Daisuke, a farm worker, fights against the forces that destroyed his planet, the Vegan Empire, also the creators of Grendizer that Duke stole to fight them. While not originaly considered part of the Mazinger series, Koji Kabuto and the Mazinger mechas appear in this series, making it sort of a sequel. Grendizer introduced the concept of a transformable Robot and a space Mecha, concepts that were later taken into other mecha series. It was extremely popular in Japan, Canada, France, Italy and the Arab World and has a strong following in those countries even today.

Mazinger Z is an alternate telling manga made in collaboration with Gosaku Ōta and Go Nagai, compared to the original and TV Magazine manga by Nagai, this manga was made more in tune with the anime while adding its own original elements. The manga focuses on a plot more similar to the anime starting with Koji checking on his grandfather after Baron Ashura had activated a bomb. With his dying breath, Dr. Kabuto gives Koji the Super Robot Mazinger Z. With the threat of Dr. Hell looming, Koji fights against his Mechanical Beasts and lieutenants with help from Sayaka Yumi and to some degree Boss.

Although similar in name to the Go Nagai work, this version by Gosaku Outa is vastly different from Nagai's work.

Great Mazinger starts after the defeat of Mazinger Z. Tetsuya Tsurugi is the new protagonist, piloting the powerful Great Mazinger, a creation of the once thought dead Kenzo Kabuto, the father of Koji Kabuto. This time the enemy is the Mycene Empire and its powerful robots.

Another version of the Great Mazinger, different from the OUTA Gosaku, being way shorter.

Mazinger Angels chronicles the adventures of four women who pilot giant robots in the Mazinger vein. The concept is a spoof on the late 70's and early 80's popular TV series Charlie's Angels. Three of the robots, Aphrodite A, Diana A and Minerva X are from the original Mazinger Z series, while Venus A is from the Great Mazinger series. Their pilots are also traditional characters from Go Nagai's universe, Sayaka Yumi and Jun Hono from Mazinger Z and Great Mazinger respectively, and Hikaru Makiba and Maria Fleed from Grendizer. The style of the manga highlights the sex appeal of both the characters and the mechas, sometimes similarly to the way Aika's female characters are shown. (Source: Wikipedia)

With the world destroyed after the summoning of Devilman, his human host Akira Fudo finds himself a tenant of Hell. Seeking the soul of his lost love Miki, Akira comes betweens a man’s search for vengeance and earns the ire of Hades. To save Miki and survive life after death, Akira will need to let his true demon out as Devilman faces off against the Devil himself! (Seven Seas Entertainment)