Sharon Publin is an 11-year-old female with distinctive red hair and violet eyes. Raised primarily by a single mother whose demanding dancing career resulted in frequent absence and limited parental supervision, Sharon developed poor social skills, manifesting as blunt, haughty, and boyish behavior. She struggles with conventional interpersonal interactions and often displays a tomboyish demeanor.

Stranded aboard the training ship Janous during the evacuation from Clayad, Sharon attempted to address a practical challenge by designing and welding custom foot pedals. This modification aimed to enable younger children to pilot the Round Vernian mecha despite their shorter heights. However, the complete lack of piloting experience led to a disastrous outcome, causing Sharon to abandon aspirations of mecha piloting.

Following this setback, Sharon transitioned to operating the Janous' turret systems. Despite initial difficulties, she demonstrated unexpected proficiency, developing precise aiming capabilities that proved strategically valuable during combat encounters. Her mechanical aptitude and adaptability became assets to the group's survival efforts.

Throughout the journey, Sharon maintained a complex dynamic with Roddy Shuffle and Fred Shuffle, embodying contrasting personality traits with the latter. Her character arc includes gradual adaptation to the challenges of space survival, though specific long-term developments across subsequent media are not detailed.