Definition of "Zorro"

I told her about the Z found etched in Hector Peña's blood and my theory that the killer may indeed picture himself or herself as some kind of avenger, a modern-day Zorro with a twist.

1999, Kate Calloway, 6th sense: a Cassidy James mystery

[…] he made himself visible at certain crucial and dramatic moments, like a kind of Zorro of the ecodefense movement.

2000, T Coraghessan Boyle, A Friend of the Earth

You are a real Zorro. You ride in, rescue the fair damsel (Maartje), start massive fires and vanish — until the next perceived injustice.

2006, Bob Onan, Taming Storm Surges: When Ecology, Engineering And Faith Meet