Teppei Takamiya

Teppei Takamiya is the main protagonist of the manga, B't X. He is the caretaker of a farm located in Kamui Island, north of Japan. His older brother, Kotarō Takamiya, leaves to study robotics in Germany and becomes one of the most brilliant scientists in the world. Five years later, the two brothers reunite at a robotics convention in Mechatopia, China, where Kotarō is to announce his latest breakthrough in artificial intelligence. The convention goes awry when Kotarō is captured by the malevolent Machine Empire and taken to "The Area".

Teppei manages to hitch a ride on his brother's capturer and reaches the Machine Empire, Teppei is attacked by Metalface, one of the Empire's soldiers. Unable to win, Teppei is thrown, bleeding, in the Empire's junkyard. His blood reaches the trashed body of X, who was once considered one of the strongest B't of the Empire, and the disgruntled B't awakens. Faced with unanswered questions and imminent destruction, X reluctantly saves Teppei, and the pair flee the Area with soldiers of the Empire in hot pursuit.

Meanwhile, inside the Area, Kotarō discovers that he has been summoned by another of the Empire's soldiers, Major Aramis, to find a way to stop the ultimate B't - a creation known as Raffaello (ラファエロ) that has begun a terrifying and uncontrollable evolution.

Teppei's main goal is to save his brother, but as he and X venture further into the Area and learn more about the Machine Empire they start to fight for the survival of the human race. On the way to the center of the Empire they gain allies that help them prevail over the guardians of the empire.

The ultimate B't eventually finalizes its evolution and the Machine Emperor appears. Before the emperor can fuse with Raffaello, Teppei and his allies confront him.