It’s Jinx — the blue-haired, chaotic champion from League of Legends. She’s known for her explosive personality, rocket launcher, and her role in Arcane as the tragic Powder/Jinx split.

Quick Scoop

Jinx is the most likely match for “the crazy blue-haired girl” because she’s the famous blue-haired marksman from Zaun who thrives on chaos and destruction. In Arcane, her backstory centers on Powder becoming Jinx after a major tragedy, which is why fans often describe her as “crazy” or unhinged.

Why people mean Jinx

  • Blue hair: Her most recognizable trait.
  • Chaotic vibe: She’s portrayed as manic, impulsive, and destructive.
  • Huge fandom presence: Arcane made her one of the most recognizable League characters worldwide.

Small caveat

If you meant a different blue-haired League character, the other common guess is Seraphine , but she’s not usually called “crazy,” so Jinx is the clear fit here.

TL;DR: the “crazy blue-haired girl” in League of Legends is Jinx.