Not much is known about Suzi Endo past before she was head of research in Cybernetics research department at Stark Industries’ Far East Division. On one occasion they were attacked by Mandarin's Avatars and all her research was destroyed before Force Works arrived to stop the criminals. They soon found Endo within the wreckage and took her to the Force Works headquarters where she helped Iron Man modify the techno-organic virus so he could use it against Mandarin. After he was defeated she apparently went back to Hong Kong to restart her research.
Sometime later, Stark contacted her and offered her a new job for Stark International in Los Angeles. She eagerly accepted the offer and flew to United States. Shortly after arriving, she was attacked by Cybermancer who was from an alternate future. The real Suzi was put in stasis and placed in Force Works sub-basement and Cybermancer took her place pretending to be her. As she was held in stasis, this Cybermancer soon replaced an absent Century on Force Works roster with the help of Iron Man, who was under the influence of Immortus (posing as Kang the Conqueror). Suzi was soon found by Amanda Chaney who Iron Man discovered and killed, but not before she managed to call Rachel Carpenter and informed her of Iron Man's betrayal. After the other members of Force Works defeated Iron Man and Cybermancer they freed Suzi from stasis and introduced her to her possible future self. She had a long conversation with her other self who told her that she also would become like her and she couldn't do anything to change it. Same time at the tech lab the time portal was suddenly re-opened, and two of the techno-Suzi's associates came through looking for her-the extremely dangerous and highly evolved Ultron and her mechanoid lover, Wonder Man. Liberating her from her prison, the three foreign entities went in search of the Cybermancer suit, but the real Suzi took it from its storage container in order to keep it out of her wicked twin's hands. Force Works was told that the alternate timeline Ultron, Wonder Man, and the techno-organic Suzi came from was completely destroyed, and Force Works decided that they would try to help them survive on their Earth. The damage was too great, however, because the still opened gateway took back what was originally from that world and claimed the lives of evil Suzi and Ultron. In an attempt to close the portal and stop the destruction, Wonder Man sacrificed himself by diving back into the dimensional doorway. It wasn't enough to seal it shut, but the real Suzi showed up with the Cybermancer armor and used the costume's gauntlet to remote control the suit and send it back where it came from to permanently seal the portal.
The threat was averted, and Suzi was left with a piece of the armor which she said she would reverse engineer. She promised the team that there would be no more Cybermancer, but eventually, Suzi re-engineered the armor and gave in to her destiny as Cybermancer although staying out of the spotlight until the events surrounding the superhuman Civil War. She was apprehended by agents of S.H.I.E.L.D. while attempting to prevent a bank heist in which three civilians were killed. She was deported back to Hong Kong rather than imprisoned in 42 in order to avoid a diplomatic crisis with China. She eventually received a distress call from a Stark satellite during Queen Veranke's Skrull invasion. Coordinating War Machine's attacks on the invaders in Russia, she soon left him when Rhodes' actions became too excessive. Needing her help again to deal with an "Ultimo virus" in Aquiria, she joined Rhodes' team to destroy all Ultimo-tech on Earth. She ultimately took off into space inside a reborn Ultimo to prevent Norman Osborn from gaining control over the robot. From space she helped War Machine transfer his consciousness into a new body.