The main character to the segment "Homecoming" in the Halo Legends series, Daisy-023 is a SPARTAN-II Commando of the UNSC Naval Special Warfare Command

Daisy was abducted and conscripted into the SPARTAN-II program by Dr. Catherine Halsey in 2517 when she was just six years old. She was then taken to the planet Reach, and trained by the AI Déjà and Chief Petty Officer Mendez, along with the rest of the Spartan children. Little is known about her, or when and how she began her investigation.

(Source: Halopedia)