Illustrator Katie De Sousa posted conceptual artwork of the "gun-toting, braid-rocking criminal" that would ultimately become Jinx on a bulletin board for potential ideas at Riot Games.

[1] De Sousa wanted to create a "completely insane female villain who is beyond any kind of reform or rehabilitation" for League of Legends.

The character was given the codename "Psycho Arsenal" and remained on the board for months until August Browning, seeking to make a weapon-swapping ADC, decided to develop her with De Sousa, while her backstory was written by Graham McNeill.

[3] They avoided giving her a "sexy persona" and instead depicted her as a pale and slender woman who wielded disproportionately oversized weapons to make her stand out from other female League champions.

[6] As established in the lore written by Graham McNeill, Jinx was once a young innocent girl from Zaun, the seedy underbelly of the utopian city of Piltover.

Her most notorious crimes include releasing a stampede of exotic animals, disrupting trade by lining the city's bridges with destructive explosives, and pulling a heist on one of Piltover's most secure treasuries.

[1] Jinx's primary weapons include her minigun nicknamed "Pow-Pow"; her shock pistol "Zapper"; her explosive grenades called "Flame Chompers"; and her customized rocket launcher dubbed "Fishbones" for its shark-inspired design.

[15] She and her older sister Vi were orphaned following the repressed undercity's failed uprising against the utopian city of Piltover, after which they were taken in by Vander, the leader of the rebellion.

After a job goes awry due to the interference of insurgents known as the Firelights, Jinx attempts to impress Silco by stealing an arcane "Hextech" gemstone from Jayce, killing six enforcers in the process.

[25] Jinx kills the enforcers on the bridge connecting Zaun to Piltover and recovers the gemstone, though she is grievously wounded during an encounter with Ekko, the Firelights' leader and her childhood friend.

Jinx finally accepts her new identity and, having weaponized the gemstone to power a rocket launcher, fires at the Piltover council just as they approve to grant Zaun its independence.

[29][30] Piltover declares martial law and Jinx, having become a revolutionary symbol in Zaun, refuses Sevika's urgings to lead a revolt until Isha is captured by the enforcers.

[32][33] Sent into depression by Isha's death, Jinx surrenders to Caitlyn and is imprisoned in a dungeon, where she hallucinates Silco advising her to end the cycle of violence by walking away from Piltover and Zaun.

[34] Jinx attempts suicide after being freed by Vi, but is dissuaded by Ekko, and the two unite all of Zaun for a final confrontation against Viktor and the Noxian army in Piltover.

[61][62] The song that plays during the sequence, "Ma meilleure ennemie" by Stromae and Pomme, became the most-streamed French-language track in 24 hours on Spotify.

[63][64] Ella Purnell won the Annie Award for Outstanding Achievement for Voice Acting in an Animated Television / Broadcast Production for her performance in the sixth episode of Arcane's first season, "When These Walls Come Tumbling Down".