UltraSeven (1967–1968)

ULTRASEVEN

This is the story about seven. Ultra Seven was not only visually different from the first Ultraman (being mostly red with a removable crest/weapon and more 'boxy'-looking eyes), but often faced numerous moral and ethical dilemmas. On one occasion, he was forced to break a promise Dan had made to a young boy who was undergoing an operation in order to protect the hospital from a monster. On another occasion, he was forced to battle the sole survivor of a small planet that was destroyed by a careless weapons test, making him wonder if he was fighting for a worthy cause.
On yet another occasion, as Dan, he desperately tried to contact the inhabitants of a space faring city before it was destroyed by the Ultra Garrison, to keep it from crashing into Earth.

ULTRASEVEN21

Still later, Ultra Seven battled a sea monster guarding an underwater city that allegedly contained the original inhabitants of Earth, who were driven undersea by the ancestors of humanity. While he was able to defeat the creature, he hesitated to intervene with an attack by the Ultra Guard, uncertain of whether or not the city's people had a legitimate grievance. This moment of indecision resulted in the utter destruction of the undersea city and all its inhabitants at the hands of humans.

Many years later, this failure to prevent the extinction of a pacifist people would come back to haunt Ultra Seven, resulting in his imprisonment as a war criminal. The charge: genocide.

While he would later escape and had sympathy from his fellows among the Ultras (notably his close comrades Ultraman, Ultraman Jack, Ultraman Ace, Ultraman Taro and Zoffy), he quickly found he could accept no help; in the eyes of virtually all space-faring civilizations, he was a murderer and protector of a cruel, war-like species.

ULTRASEVEN X

Since then, Ultra Seven seems to have been pardoned, since he joined with the other Ultra Brothers in aiding rookie Ultra Warrior Ultraman Mebius.

Unlike most other Ultramen, Ultra Seven does not demonstrate any of the time constraints that plague most of the other heroes of the Ultra Series. On occasion however, the green Beam Lamp on his forehead would begin blinking in a similar fashion to the Color Timer that the other Ultras had.

However, this tended to occur when Ultra Seven was in mortal danger, suggesting it warned him how badly weakened he was rather than how much time he had left to fight. This is similar to some of the more recent Ultras, whose timers acted as an indicator of battle damage rather than time limit.

by Wikipedia