Memempu is a nine-year-old girl and one of the central figures in her narrative. She is established as a remarkable prodigy, having already graduated from college and earned seven doctorates, a level of academic achievement that sets her far apart from her peers. Her primary interests lie in the fields of mechanical invention and modification, and she possesses a very strong and active curiosity about the world around her.

In terms of personality, Memempu is outgoing, headstrong, and possesses a significant degree of self-confidence that can sometimes border on overconfidence. She has a tendency to be a stubborn realist who prefers to rely on her own considerable abilities and solve problems by herself, often believing that working with others is an unnecessary complication. This can make her appear dismissive of those who cannot keep up with her, including her father, whom she occasionally views as a bumbling or ineffective figure. However, this attitude is a key part of her character, as her youth and lack of experience mean her confidence is not always matched by the reality of dangerous situations.

The primary motivation driving Memempu is a recurring dream she has of a towering, unfamiliar structure. She has seen this vision since childhood and becomes determined to find this place in reality. This ambition leads her to aspire to become a Marker, a professional explorer who navigates and maps the dangerous labyrinthine underground colonies where she lives. Her dream is not just a vague fantasy; it is a clear goal that shapes her decisions and pushes her to leave the safety of her home. She receives a mysterious package containing a gem and a photograph that matches her dream exactly, an event that directly catalyzes her journey and sets the course of the story in motion.

Within the story, Memempu acts as both the instigator and the navigator for the central adventure. Her relentless pursuit of the location from her dreams is the primary reason she and her father leave their colony. She leverages her unique abilities to assist in this journey, most notably her superhuman sense of direction and exceptional spatial cognition, which allow her to navigate the complex and often treacherous tunnels of their world. In moments of crisis, she can quickly formulate escape plans and use her knowledge of the terrain to evade threats. She also serves as the pilot for her father's large mechanical suit, known as Big Tony, working in tandem with him to operate the machine in combat and exploration.

The most significant relationship in Memempu's life is with her single father, Gagumber. Their dynamic is central to the narrative and is a complex one. While she often criticizes his skills and sees him as an obstacle to her ambitions, she is fundamentally dependent on him. Their personalities are stark opposites; where she is brash and impulsive, he is more cautious and experienced. This balance is crucial for their survival. Although Memempu believes she can succeed on her own, she repeatedly learns that her father's knowledge and protective instincts are indispensable. A key moment of development occurs when her overconfidence leads her into a life-threatening situation, and she is forced to realize that she cannot reach her destination without his help, marking a significant step in her emotional maturity. The bond between them is tested further by the revelation that she might be a Rainbow Child, a being with extraordinary genetic properties, and that Gagumber may not be her biological father. Despite this existential crisis, their relationship endures, defined by the love and care he has shown her as her parent, regardless of blood ties.

In terms of her development throughout the story, Memempu begins as a brilliant but naive child whose intelligence has insulated her from many of life's harsh realities. Her journey is one of learning humility and the value of cooperation. She starts with the belief that her intellect alone is sufficient, but she is gradually forced to confront her own limitations and the importance of trusting others, particularly her father. The challenges she faces, from fighting monsters to dealing with dangerous political factions, chip away at her arrogance and force her to grow up quickly, ultimately leading her to a deeper understanding of her own identity and the true meaning of family.