Yumi Sasaki's parents had a whirlwind romance, married, had twin daughters and then found it difficult living with eachother. Although Yuki and Yumi loved their parents dearly, they tended to identify with one over the other. Yuki was drawn to her mother's spiritual nature and love of the magical and unexplained; while Yumi was facinated by the high technology that was the focus of their father's life. Although they did not divorce, the twins' parents drifted apart, Yumi and her father lived in the city in an apartment furnished by the company his father had started Sasaki Industries. Yuki and their mother lived in their home out side of Osaka. Both girls were unusually bright and observant. When they were eleven a man approached their mother about Yuki's potential and she left with him to the mythical city of Shamballah. Yumi missed her sister terribly, but she lost herself in her studies. Years later when the Nippon Ichiban team was being formed; Yumi was asked if she could provide technical assistance to the team. She did more than that. She joined as a combat member. Her father was unsure of this course of action. He was really not sure when she volunteered her sister to also join the team. Yuki had returned with an impressive command over magic and an intense desire to help stem the tide of evil. The sisters, in a moment of "Twin-Thinking" each took a name that meant "Jack of All Trades" however, Yuki's name is an old word while Yumi's name is a new word. This causes some exasperation to their team mates but nothing they can't get over. Yumi might be one of the 5 most intelligent people on the planet. She has met some of the others; Mentiac from UNTIL's UNITY team, and the Empress. Mentiac took an immediate dislike to her (because, unlike him, she appears like a normal, attractive teenager), but Empress was enchanted. They actually communicate semi-regularly, and the Empress might even aid Yumi if the was very desperate. Yumi tries very hard to stand out. She hates being known as "a girl-Genius" and enjoys "Superheroine" much better. She is active and often rushes into danger without thinking. Originally, she was going to call herself, "Gadget Girl" but a "Gadget Boy" already existed. She and he have met on one occasion and he has quite the crush on her. "Sure, I understand it; I just don't want to talk about it; physics can be boring you know." Speak quickly and carry a large blaster rifle. A great reason to buy Gadgets and Gear. She now has alot of premade toys. If you want her to be less flexible/powerful, drop her gadget pool to 50 pts. If you want to go the other way. Increase it to 100 pts. An attractive, enthusiastic young woman. Gadget Girl dresses in western fashions, dyes her hair pink and pretty much tries to be noticed for anything other than being really smart. Her combat suit is a skin tight metallic fiber cosume, white with red shoulder armor, guantlets, bootsl and helmet. The helmet has a clear face plate. Has numerous compartments on her battlesuit for her gadgets. They appear to be belts, holdsters, and bandoliers but they are actually part of the suit itself, they have a gold color scheme.