X5-210, or "Jondy", is one of the twelve X5s who successfully escaped from Manticore in 2009.
'09 Escape
Jondy ran alongside Max during the escape. She was shot at just before the gate by Lydecker's soldiers, though she made it out of Manticore.
Post-Escape
Little is known about Jondy after the escape. Zack remembers that she has taken up residence close to the Golden Gate bridge in San Francisco and works at a bar. When Logan Cale ran a hack telling all escapees to leave their current positions, Jondy called in to Zack confirming she had left.
Note
Jondy was only ever seen as a child.
In fanfiction, she is popularly thought to have "fire-red" hair, dark blue eyes, and is believed to have a quasi-violent sense of humor.