Schindler, former Chief Conductor of the New York Symphonica, served as the right-hand man to its leader, Sagan. He secured Sagan's trust through his actions during the war against the D2 monsters, rising to command subordinates and Musicarts within the organization. His personality blended intense self-esteem with arrogance, often displaying contempt for those he deemed inferior. This elitism fueled his conviction that only a select group of the "strong" deserved to survive, leading him to orchestrate D2 attacks to eliminate the "unworthy" or "weak," actions he framed as "nation-building" or "cleaning up garbage."

A failed musician, his unfulfilled aspirations bred deep bitterness and jealousy, particularly towards naturally gifted individuals like Takt Asahina. This resentment extended to music itself, which he viewed as emotionally manipulative and "useless," despite its core role in the Symphonica. Publicly, he maintained a rational facade, masking his supremacist beliefs and genocidal agenda.

He wielded authority over several Musicarts, most significantly Jigoku (Hell). Schindler utilized her unique ability—activated by a tuning fork—to deliberately awaken and control D2s. This power was central to his schemes, including the Symphonica festival attack that killed Cosette Schneider, triggering her transformation into the Musicart Destiny. This incident also connected to the earlier death of Takt Asahina's father, hinting at a pattern of manipulation. While Schindler believed Jigoku served him, she primarily followed Sagan's directives, revealing Schindler was not a "true" Conductor. He also briefly commanded the Musicart Walküre (Valkyrie) before her dismissal.

Sagan's evident favoritism towards Takt and his father, Kenji Asahina, intensified Schindler's conflict with Takt. After failing to recruit Takt and Destiny, Schindler actively sought their elimination, directly disobeying Sagan's orders against harming them. This insubordination, coupled with the exposure of his orchestrated D2 attacks and misuse of authority, led to his downfall. Sagan, acting through the Musicart Tengoku (Heaven), formally stripped Schindler of his rank, uniform, and authority. The revelation of Jigoku's true allegiance shattered his self-image.

Demoted and arrested, Schindler suffered a complete mental breakdown. Unable to endure the loss of the power and status that defined him, he descended into incoherent ranting about his perceived greatness. Confined to a mental hospital, he became passive and detached, effectively erased from the Symphonica and the narrative, depicted finally as utterly broken and powerless.

His name alludes to Beethoven's biographer, Anton Felix Schindler, known for fabricating aspects of Beethoven's life, foreshadowing Schindler's own fraudulent persona. His ideology, appearance (blonde hair, blue eyes), and actions parallel historical fascist figures.