Echo is a character appearing in American comic books published by Marvel Comics. Created by David Mack and Joe Quesada, the character first appeared in Daredevil #9. Maya Lopez is a Native American of the Cheyenne Nation. Her Echo guise includes a white handprint that covers part of her face. She is one of the few deaf comic book characters. She has also adopted the Ronin codename and was a host of the Phoenix Force.

Ronin is an alias used by multiple characters appearing in American comic books published by Marvel Comics. It was first adopted by Maya Lopez in The New Avengers #11 by Brian Michael Bendis and Joe Quesada. Following this, the Ronin mantle has been taken up by characters such as Clint Barton, Alexei Shostakov, Eric Brooks, and Bullseye.