Brain Powerd (1998)

Ayato Kamina, a 17-year-old high school student, lives in Tokyo Jupiter oblivious to the world around him, having been raised to believe that the rest of civilization has been destroyed; but everything changes when a mysterious alien civilization invades his home.

The story revolves around Duke Fleed who is a survivor of the Vega Star, raised by Dr. Umon as his adoptive son, and known as Daisuke Umon on Earth. Years after his arrival, he's faced with the threat of King Vega and his army, who want to conquer the Earth. With his friends Koji and Hikaru (and later his kid sister Maria Grace), Duke decides to fight back using his best weapon, the almighty Grendizer.

Hiroshi Shiba is a car racer who is mortally wounded in a laboratory accident, but restored to life by his father, Professor Shiba.

While pursuing fugitives the Space Federation police officer Birdy Cephon Altera finds herself on Earth.

Set in the future, a giant fighting machine called the Aquarion is humanity's only effective weapon in the fight against the technologically advanced species called the Shadow Angels.

This story chronicles the crew of the transformable carrier Daikū Maryū and the Super Robot Gaiking's battle against an invading race of aliens called the Dark Horror Army, whose home planet is facing destruction by a black hole. Notable aspects of the series include the dinosaur-based designs of the Daikū Maryū and its support machines and the use of part of the carrier to form the main robot. The Gaiking robot is helmed by former baseball star Sanshiro Tsuwabuki, whose latent psychic powers make him the only one capable of piloting the giant robot.

Haruto Tokishima, a high school student, discovers Valvrave, a mysterious and very powerful machine, and after controlling it Haruto becomes immortal.

Five unlikely teenage heroes and their flying robot lions unite to form the megapowerful Voltron and defend the universe from evil.

Earth kids enter a conflict between two factions of Transformers.

The story revolves around Shu Ouma, a high school boy who inadvertently obtains an ability called "The Power of the Kings" that enables him to draw out items called "Voids" from other people. He is then thrown into the conflict between a resistance group called Funeral Parlor which aims to restore Japan's independence from a quasi-governmental organization known as the GHQ. In the process, Shu has to deal with the burden his ability puts on his shoulders and the horrific mystery of his past.