Sobeille is named for her uncle Sobo. She was born the day her grandmother Rosalyn died; something Sobeille believes is of great significance. As a pup she was affectionately known as Miette.

Sobeille is invested in her family's legacy. Hungry to learn everything of her female ancestors, Sobeille believes that Sapphiqian (and female) blood is superior. At a young age she spent time in neighboring camps including Moonglow and Moonspear, learning the art of bone reading from Sialuk and the storied traditions of Moonspear from Kukutux. Drawing from her rich heritage and multi-tribal beliefs, Sobeille is fascinated by the cultures of others. An unflinching sexist, Sobeille is downright dismissive of men. The older she has gotten, the more divisive her mannerism appears -- at times she will struggle with social cues or do things outside of cultural norms.

In early spring of 2024, Sobeille committed her first wolf murder. In August of 2024, Sobeille attempted to kill two more wolves but was discovered.

In the fall of 2024, Sobeille was kidnapped by a she-wolf named Sivaak. Having no chance to overpower her kidnapper, Sobeille followed the cutt-throat until she felt betrayed by Sivaak's alignment with a man. Fleeing alongside Yura, Sobeille returned to Sapphique to find her family gone and the coast raided by pirates. Suffering this loss, Sobeille committed her first unofficial drop ceremony, believing this to be Shadess' first murder that officially indoctrinated them as kill-sisters.

Invested in rescuing her family, Sobeille orchestrated a rescue-raid alongside her siblings and several packs. The rescue was a success, but shortly after Mireille succumbed to her injuries and Chacal committed suicide. Before their deaths, the sisters collaborated to make Shadess leader -- a decision that undermined Sobeille's years of dedication and left the young girl confused and unmoored. Having no closure, Sobeille began to re-envision her future.

Fueled by the grief of two losses -- what she believed was her birthright and the death of her mother -- Sobeille slipped into despair. She encountered a man in Ankyra at the height of her ill-timed season; at first, she considered killing him outright -- but as they fought, she recalled her vow with Chani and turned herself to him. That night she killed him, leaving his blood to mix with the deep blue hues of the Moonpool.

Not yet showing signs of her pregnancy, Sobeille discovered a dead woman fat with pups on patrol several weeks after. Miraculously, the pups were alive -- doing the unthinkable, she captured a nursing seal alongside Yura and Lafayette. The seal was kept for several months in Astera's den, used to nurse the puppies until weaning.

In July 2025, Sobeille gave birth to her new legacy.