Jinx and Ekko.

As a child, Ecco was a carefree and mischievous boy with an inventive streak, which led to Benzo. Benzo hired him to repair mechanical parts at his pawn shop despite his young age. As a child, Ecco looked up to Vi, whom he considered an older sister, and aspired to be as strong and tough as she was. He could also be enterprising and cunning. After Silko took control of the underground, Ecco was forced to mature quickly in order to survive and became a leader, seeking to rally the Zaunites of his generation against Silko's rule and work with him to create a safe haven for everyone. Although he was eventually able to build a place where the young Zaunites abused by Silko could live in peace through his tenacity and ingenuity, the experience left Ecco a hardened and harsh young man with a strong sense of duty to free his people from all the suffering they had endured under Silko's rule; This eventually led him to found the Lights organization and use his inventive talents to find effective ways to defeat Silko's followers in combat and sabotage his drug supply.

Ecco is a Zaunite vigilante and leader of the Fireblazes. Hardened by the traumas he endured as a child, Ecco leads the charge to free the Undercity from Silko's rule and is willing to put everything he has, including his own life, on the line to protect the people he cares about.

As a child, Powder was a kind, inquisitive, and creative girl with a reckless streak, often making decisions that negatively impacted those around her. Because of this, Milo constantly criticized her for her incompetence, which eventually led to Powder developing an inferiority complex and a strong desire to prove her worth to her adoptive siblings. She also suffered from attachment issues due to the loss of her parents as an infant and had a hard time following orders, which was partly why she disobeyed V's orders to stay behind during their mission to save Wander from Silko. After accidentally killing her adoptive family and seemingly being abandoned by V at her weakest point, Jinx's trauma became extremely pronounced and caused her to suffer intense hallucinations of Milo, Claggor, and V for years after being taken in by Silko. This also stunted her emotional development, leaving her with childish tendencies even in her late teens, and prompted her to adopt a playful and energetic façade to hide all the pain and guilt she held beneath the surface. Over time, her unhealed trauma turned Jinx into a chaotic and excitable individual who enjoyed death and destruction, and had no remorse for the people she killed along the way. Her wild behavior earned her a reputation as an unpredictable individual among Silko's crew, and eventually reached the point where even Silko himself could not keep her under control. Her mental instability also caused her to display sarcastic, brash, and dark behavior towards her enemies or people she did not fully trust.

Jinx, born Powder, is a notorious Zaunian criminal. Vi's younger sister and one of the two main protagonists of the Mystery series. When she was a little girl, her parents died in a failed rebellion against Piltover. Wander, the leader of the rebellion, adopted her and her sister. After a series of tragic events separated Jinx and Vi, she changed dramatically and irrevocably, abandoning her former identity as Powder and becoming the nihilistic anarchist she is today. Silko is also her adoptive father.