Here you will find all the characters that have used the identity of the ninja Ronin.

Prime Universe

Maya Lopez
First to use the identity to spy on the Hand and Elektra for the New Avengers
Clint Barton
Used the identity to hide his return and because Kate Bishop was using the Hawkeye name
Alexi Shostakov
Use the identity against the Secret Avengers before returning to Red Guardian
Eric Brooks
Given the Identity to hide from his enemies and aid the Avengers
Stole the identity to discredit Barton.