Shado's father, a man named Tomonaga, was Yakuza and knew where a Yakuza fortune was hidden. Former OSS agents attempted to discover that fortune after the war, and killed his wife to make him talk; Tomonaga executed seppuku thereafter. The Yakuza took his orphaned child to be raised as their instrument of vengeance, and gave her to a master kyudoka, Yoshitomo, so he would raise her. They had the child tattooed with a dragon to mark her allegiances and giri.
Yoshitomo himself owned obedience to the Yakuza due to ancestral giri, and taught her in the way of Bushido and kyudo, until she became a master of both, becoming shado. She then was ordered to kill all the men responsible for the death of her parents, and left Japan for several years. Her path crossed Green Arrow's twice, on two of her targets. Green Arrow first opposed her, but collaborated with her on killing one of her targets. Later, Dinah "Black Canary" Lance, then Green Arrow's woman, was captured and tortured by Shado's last target. Admitting his vengeance was more important than hers, she let him kill the man.
The oyabun commanded that she cut off her own bow finger to atone for not killing the man herself, but Yoshitomo stopped that foolishness by threatening to shoot the oyabun, allowing Shado to flee. The fool gunned Yoshitomo down in anger, and Shado took his life.
Thus, war has been declared between Shado and a large part of Japan's underworld. They will either kill her, or she will destroy them; there is no other way.
Later Ollie would once again meet Shado. Ollie was blackmailed into hunting her down to find a treasure map by CIA Agent Osborne, Ollie finally caught up with her in but as soon as he found her, she shot him in the chest with her own arrow. Shado went on to nurse him back to health, we also discover that while he was healing and drugged from the medication that Shado had given him that he was raped by Shado and conceived a son called Robert. Ollie would not discover this till years later. After she had healed him she said that she mistaken him for one of her attackers and he left without the map. When they met years later Shado showed Ollie his son Robert and went on to tell him how she had raped him. She then told him she wanted him to have nothing to do with his son. She still lives calmly under assumed identities, doing what has to be done and raising her son to become an archer.
In the series Green Arrow & Black Canary it was revealed that Shado was forced to kill Green Arrow by Dr. Sivana in order to save her son, Robert Tomonaga, from an unnamed sickness. Dr. Sivana promised to heal Shado's son if Shado assassinated Oliver Queen. The shot that was suppose to kill Oliver Queen missed and hit his son Connor Hawke. Afterward Connor's injured body was taken to try an lure Oliver Queen into a trap. Shado later teamed up with Green Arrow, Plastic Man, Black Canary, Batman, Speedy, and Dodger and attacked Dr. Sivana's lab.
Shado appears in the Arrow TV series, portrayed by Celina Jade. In the show, she is Yao Fei's daughter, captured by Ed Fyers and used to blackmail the ex Chinese officer.
In the show she seems to have fallen for Oliver and despite his kinda liking her too he states he has his girlfriend Laurel at home who he still loves. She then replies, "it wasn't the right time".