Lulu is a central figure in Brave Bang Bravern! who initially appears as a mysterious young woman, approximately fourteen to fifteen years old, with medium-length gray hair and red eyes. She is discovered by Lewis Smith on a beach shortly after the Deathdrive known as Superbia is defeated in battle, having been ejected from Superbia as a kind of organic battery that the Deathdrives use to power themselves. When first found, Lulu does not speak any human language and behaves in a nearly feral manner, even attacking Lewis, but he patiently cares for her as she recovers. Over time, she undergoes rapid physical and mental development, learning to speak, eat, walk, and interact with others, gradually gaining full self-awareness and autonomy. Her early vocabulary includes the distinctive utterance Gagapi. A physical examination reveals that her body is almost completely human, except for an unknown substance located on the back of her hand. Lulu is revealed to be one of multiple similar beings used as power sources by the Deathdrives, and Superbia later demands her return upon realizing she has become sentient. Despite her origins, Lulu forms a close bond with Lewis Smith, who becomes her caretaker and later her co-pilot in a Titanostrider. After Lewis sacrifices himself in battle, Lulu inherits his passionate spirit and courage, which enables her to achieve a Courage Fusion with Superbia, transforming her into a vital combat force that fights alongside the multinational allied forces against the Deathdrive threat. Throughout the series, Lulu evolves from a passive, exploited life form into an independent and active participant in the conflict, gaining the ability to co-pilot advanced mecha and eventually even demonstrating time travel capabilities that alter the course of events. Her key relationships include her deep connection with Lewis Smith, her alliance with the main pilots Isami Ao and the robot Bravern, and her complex history with Superbia, the Deathdrive who originally used her. Lulu serves as both a symbol of the Deathdrives cruel methods and a testament to the possibility of change and growth, ultimately becoming an indispensable part of the human resistance.