Born in Japan and imprisoned by the Yakuza, Maki Matsumoto witnesses Bullseye defeating her captors and is thusly inspired to a life of an assassin. She may have been inspired by Bullseye, but Lady Bullseye definitely stands on her own.
While she didn’t initially have super powers, she eventually is gifted the ability to turn into gaseous form by the Guild of Assassins. Changing from one state to the other quickly makes her almost undefeatable.
As skilled as she is in combat, she is just as skilled as a lawyer, and her secret identity allows her to be a rival for Daredevil both in the streets and the courtroom.