TV-Series
Description
Gain Bijou is a central character known as a notorious and highly skilled specialist in orchestrating mass exoduses from the domed cities that dominate his world. He has earned the fearsome nickname "the Black Southern Cross," a testament to his formidable reputation as a rebel and combatant. He is introduced when he is taken into custody within the Siberian Domepolis, but this capture is revealed to be part of his larger mission to oversee an exodus of citizens who wish to flee the oppressive control of the government.

Regarding his personality, Gain Bijou is depicted as a charismatic and mysterious figure who is decisive and action-oriented. He does not hesitate to take bold, often reckless steps to achieve his goals, such as breaking out of prison and committing high-profile acts like kidnapping a duke's daughter. He is portrayed as a seasoned and somewhat hardened adult, contrasting with the younger, more idealistic characters around him. Despite his serious and dangerous line of work, he is not a stereotypical villain; his actions are driven by a clear sense of purpose in the movement for freedom.

Motivation drives Gain Bijou's every action. He is an expert in liberation, dedicated to breaking people free from the domed cities and leading them on perilous journeys to start new lives elsewhere. His personal reasons for this are rooted in his past, and he is haunted by memories that continue to shape his decisions. He is compelled to confront his inner demons as the story progresses, suggesting a deep personal connection to the cause beyond mere contract work.

In the story, Gain Bijou acts as the primary catalyst for the protagonist's journey. He is the one who, after escaping from prison, compels the young video game champion Gainer Sanga to escape with him. He then seizes an Overman, a powerful biomechanical robot, and assigns Gainer to pilot it, effectively dragging the reluctant teenager into the heart of the rebellion. While Gainer becomes the ace pilot of the titular Overman King Gainer, Gain continues to operate on the battlefield, piloting his own machine and using his immense combat skills to protect the exodus and fight against the pursuing forces of the Siberian Railway. He serves as a mentor, a partner, and a commanding presence for the exodus movement, though the dynamic with Gainer is one that changes over time.

Key relationships are central to his character. His most important partnership is with Gainer Sanga, who he trusts to pilot the powerful Overman. This relationship evolves from one of necessity to a complex bond of friendship and mutual reliance. He also has a significant connection with Princess Ana Medaiyu, whom he takes hostage, though she often seems more enthusiastic about the adventure than a typical captive would be. A notable relationship is with his rival, Asuham Boone, a task force captain who is obsessed with stopping him. Despite their antagonism, it is suggested that Asuham considered Gain a close friend and partner, adding a layer of depth to their conflict. The exodus movement also brings him into proximity with other rebels, including Gainer's classmate Sara Kodama.

As a character, Gain Bijou demonstrates development from a seemingly straightforward, legendary rebel into a more vulnerable individual forced to confront his past. The narrative shows him haunted by visions and memories, implying a traumatic history that fuels his present actions. His role as the infallible leader is challenged as he faces his inner turmoil, showing a more human and conflicted side beneath the surface of the infamous "Black Southern Cross".

His notable abilities are primarily in combat and leadership. He is a formidable fighter and a highly capable pilot of Silhouette Engines, the standard military machines, and likely Overmen as well. His combat prowess is such that he quickly overpowers guards and survives intense battles against elite forces. His strategic mind makes him an exceptional leader and coordinator of the exodus, capable of planning large-scale escapes and guiding a massive procession of people across dangerous territories. His skills are not supernatural but are presented as the peak of human capability in his world, earned through extensive experience.