Friedrich Otto Noblemain, known as Fon, serves as a scientist for the Shishido Conglomerate. His foundational work directly created the core programming for Leopard's artificial intelligence, establishing a clear technological lineage from creator to creation.

Fifty years before the main events, Friedrich fought in the historic conflict against Nerval, standing alongside allies like Kagura and Honoka Kawai. This placed him among the key figures resisting Nerval's efforts to subjugate humanity through technological domination. Evidence of his ongoing research into Nerval's control mechanisms and their effects on humans exists within his laboratory, where preserved Nervalist vassals are housed.

As a scientist, Friedrich displays distinctive traits including cross-dressing tendencies and the habitual use of a cigarette holder. His technological legacy endures through Leopard's core functionalities and personality, specifically the embedded aristocratic eccentricities and combat capabilities.

Friedrich's influence persists primarily through Leopard's continued existence and the Shishido family's ongoing conflict with Nervalist remnants.