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Odile was created as indecisive but rich in emotions and inspiration, in contrast to Odette who possessed a strong will.
After the Magrasea backup was cut from external communications, Pierides started withering without the regular transfer of operands by humans. Odile considered the Trader Collective's offer to duplicate some of the art pieces to resell in exchange for operands, but Odette refused and instead accepted from a stranger a flower that would generate operands. Odile was wary at first but she let Odette convince her.
Eventually the flower entirely corrupted Odette, who merged with Odile's Tertiary Layer to corrupt her, and the flower opened the Data Fracture enabling Pierides to be claimed by the Entropy virus.
When Wisdom and the Exiles investigated Pierides, they found Odile in the Administrator Center. After being awakened by the Professor entering her Tertiary Layer, Odile helped them find the Data Fracture and close it, but by redirecting her operands to close the Fracture instead of focusing on pushing back her Entropization, Odile became completely corrupted and transformed into Black Swan.
- Odile and Odette are named after characters of Tchaikovsky's ballet Swan Lake, who are respectively the Black and White Swan.