Daisy is a computer specialist and a key member of the Monster Makers, also known as the Wild Bunch, the group of researchers responsible for the creation of the Digital Monsters in the 1980s. Her real name is not revealed, as she is known only by this nickname. Her area of expertise lies at the intersection of software and robotics.

In the year 1984, while a doctoral candidate at Palo Alto University, Daisy was recruited by a fellow student, Lee Jiang-yu, to join Professor Rob McCoy's new laboratory. Her initial motivation for joining was a personal interest in Lee, though she quickly became engrossed in the project's ambitious goal of creating virtual life forms within a computer network. During this time, her primary focus was developing the Ark, an interface that would allow people in the real world to interact with Digimon in the digital world. She also advised Lee on the evolution algorithm he was developing for the creatures. While she befriended most of the group, she initially had difficulty getting along with the eccentric member known as Shibumi. It was Daisy who had the first terrifying encounter with a realized Digimon, an experience that deeply affected her. One night while working alone, she was attacked by a Digimon that had somehow manifested physically, leading her to destroy the lab's monitors and shut down its mainframe in a panic. This event caused her to become more withdrawn and she was eager to put the project behind her.

Roughly twenty years later, Daisy was reunited with the other Monster Makers when Mitsuo Yamaki, the head of the secret government organization Hypnos, brought them together to use their knowledge to eliminate Digimon. Her role in the story is that of a brilliant and pragmatic scientist who, despite her troubled past with Digimon, uses her technical expertise to solve critical problems. When the children, the Tamers, became trapped in the Digital World, Yamaki called upon Daisy and the other creators again. They worked together to build an ark to bring the children home, and when the ark later gained a will of its own, Daisy was the one primarily responsible for redesigning its physical form into a powerful battle steed named Grani. She later worked with her colleague Riley to further modify Grani, equipping it with the Yuggoth Blaster. As the D-Reaper crisis escalated, she and the Monster Makers collaborated on the final strategy, Operation Doodlebug, to neutralize the entity.

Daisy maintains key relationships with the other members of the Monster Makers. She works closely with Lee Jiang-yu, known as Tao, and with her fellow researcher Riley. Her history with Shibumi is complex, marked by initial friction and a lingering suspicion about his mysterious actions, such as leaving a floppy disk with a modified evolution algorithm behind after the project shut down. She also communicates with a contact named Johnny Beckenstein to gather crucial intelligence on the D-Reaper. While not a frontline fighter, her contributions are invaluable; her technical abilities in programming, system architecture, and hardware design are central to the group's efforts to counter the Digimon and D-Reaper threats. Her specific ability to design and modify the ark into Grani is a notable demonstration of her practical engineering skills. Initially motivated by academic curiosity and personal connections, her role in the present day is driven by a sense of responsibility for what she helped create and a pragmatic need to solve the crises unfolding in the real world.