The character at the center of Alita: Battle Angel is a cyborg originally designated as Yoko before her memories were lost. When the kindly cyber-physician Dr. Dyson Ido discovers her intact human brain and the remains of her torso in the vast scrapyard of Iron City, he brings her back to life in a new body he had built for his late daughter, giving her the name Alita. With no recollection of her past, Alita initially exhibits the innocent curiosity and docile nature of a teenage girl, eagerly learning about the world around her. However, this gentle and unassuming surface belies a fierce determination and an instinctive, almost feral aptitude for lethal violence. As she begins to navigate the treacherous streets of Iron City, her dormant warrior personality emerges, revealing a character who is courageous, headstrong, and possesses a profound sense of justice.

Alita's primary motivation is a quest for identity. She is driven to uncover the mystery of her forgotten past, a need that becomes intertwined with her desire to protect her newfound family and friends. Looking upon Ido as a surrogate father, she rebels against his wish to shield her from her history, instead choosing to become a Hunter-Warrior, a bounty hunter tasked with eliminating cyborg criminals. Her path is further shaped by her relationship with Hugo, a street-smart boy who dreams of escaping to the floating city of Zalem. Hugo becomes her first love and guides her introduction to the brutal sport of Motorball, a gladiatorial race that serves as both a distraction and a battleground for her emerging skills. These key relationships ground her humanity, as she struggles to balance her loving, innocent side with her growing power as a living weapon.

Throughout the story, Alita plays the crucial role of a catalyst for change in Iron City, directly challenging its corrupt rulers and their connections to the sky city of Zalem. Her development is marked by a series of traumatic losses and devastating defeats. After a brutal battle destroys her initial body, Ido reluctantly installs her into a powerful and forbidden Berserker body she discovered in a crashed spaceship from the past. This act unlocks her true potential and triggers clearer memories of her origin as a warrior from Mars trained in an ancient cyborg martial art known as Panzer Kunst. The death of Hugo at the hands of the city's oppressive system becomes the final turning point, transforming her grief into a focused, unyielding resolve for revenge against the tyrannical master of Zalem, Nova, solidifying her transition from a lost girl into a fearsome "Angel of Death".

As a full cyborg, Alita possesses a number of remarkable abilities. Her most notable skill is her mastery of Panzer Kunst, a lethal fighting system that returns to her instinctively and allows her to perform superhuman feats of combat. Her body is highly advanced, and her Berserker form grants her enhanced strength, speed, agility, and the ability to instantly reconfigure her limbs into weapons. Her signature weapon becomes the Damascus Blade, an incredibly sharp and nearly indestructible sword that she can deploy from her person. Furthermore, Alita's "heart" is not a biological organ but a powerful energy core, a piece of pre-war technology that can generate enough energy to power a city, making her a force of nature finally learning to harness her own devastating potential.