Sobeille is named for her uncle Sobo. She was born the day her grandmother Rosalyn died; Sobeille believes this is of great significance. Those in Sapphique may refer to her as her pet name Miette, given to her for her small stature.

A proud Sapphiqian, Sobeille is invested in her family's legacy. Hungry to learn everything of her powerful female family, Sobeille believes that Sapphiqian (and female) blood is superior. Sobeille has 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. An unflinching sexist, Sobeille is downright dismissive of men.

Struggling with social cues, Sobeille has become increasingly alienated as she ages. There are parts of herself even Sobeille is uncomfortable acknowledging.

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 the much stronger woman, Sobeille willingly followed the cutt-throat until she felt betrayed by Sivaak's alignment with Black Scar. 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 alongside Shadess, believing this to be Shadess' first murder that officially indoctrinated them as kill-sisters.