Elektra
Most heroes don't really stick to one origin story and with Elektra, we see many stories but we see the similarities.
She comes through from a rich family of Greek origin, resulting in their wealth her father was a powerful man, sadly her mother passed on while giving birth to Elektra.
Elektra was kidnaped at the age of 20 by a group of terrorists, A tussle broke out and her father was killed, She then set out to seek revenge, she traveled to China in the hopes of learning and mastering martial arts.
She became an assassin that will avenge her father's death.