Schnee operates as a Magus within the organization Ideal des Himmels. Functioning within its hierarchy, she handles operations involving the retrieval and monitoring of other Magus units, specifically Type Zero models such as Noir. She provides vital intelligence to protagonists concerning Kurokamen's potential memory loss, suggesting deeper connections between key figures. Her presence marks significant events like the Silver Storm incident, where her actions support Ideal's objectives. Schnee appears during confrontations between protagonists and antagonistic forces, including engagements against Enders and internal conflicts within Amasia's remnants. Later, she participates in battles against large-scale threats, notably a coordinated assault on a swarm of Enders that caused widespread destruction and human casualties. Her role encompasses strategic operations, supporting efforts to locate the mythical city Histoire and engaging factions attempting to exploit Magus technology. Interactions with Ideal leader Weisheit Blaurecht underscore her alignment with the organization's goals. Schnee's character lacks explicit personal development or an independent narrative arc, functioning primarily as a recurring operative within Ideal's structure. She remains an auxiliary figure in the broader conflict surrounding Noir's origins and the pursuit of lost technology.