If you're looking for manga similar to Ultima: The Maze of Schwarzschild, you might like these titles.
Mega Man (Rockman) and Bass (Forte) join forces to fight against King, a robot that wants to create a human-free nation.
Enter an exciting new future with Mega Man ZX! Hundreds of years in the future, humans are able to merge with living ‘biometals’, transforming into Mega Men! But are even the combined powers of the Model Z and Model X biometals enough to take down the sinister Slither corporation?
The distant future. Invaders from another world attack without warning, unleashing a new type of threat: weapons known as “machine lifeforms.” In the face of this insurmountable threat, mankind is driven from Earth and takes refuge on the Moon. It is the year 11941, and the long war against the machines rages on. In an attempt to break the deadlock, the Council of Humanity forms a new infantry unit of female androids: YoRHa. Deployed to the planet’s surface, these soldiers now fight to recapture Earth for the glory of mankind…