Oswald Whistler, a composer and musical director, cuts a striking figure in his purple jacket, light purple vest, white shirt, navy blue tie, and voluminous dark blue-grey hair. His life unraveled after the death of his daughter Melina from an incurable illness, driving him to partner with antagonist Jean Descole in developing the Detragan—a machine intended to transfer Melina’s memories into a new host. Repeated failures plagued the device, save for a single successful transfer unknown to Oswald. Descole’s orchestrated “game,” promising eternal life, lured potential hosts, with Oswald recruiting young girls like Amelia Ruth under the pretense of memorializing Melina. During the scheme, he deliberately lost Puzzle No. 003, his reasons unclear.

As the Detragan’s ability to sustain Melina’s memories faltered, Oswald grew desperate, attempting to implant her consciousness into Amelia. Professor Layton intervened, revealing Melina’s memories had already taken root in her friend Janice Quatlane. Confronted with this truth, Oswald embraced Melina’s spirit within Janice, expressing remorse before her departure. He played a farewell melody on the broken Detragan and was subsequently arrested.

His collaboration with Descole included composing an opera tied to Ambrosia, a mythical kingdom linked to eternal life, which he dedicated to Melina. Oswald’s research into Ambrosia involved Dr. Andrew Schrader, a scholar of its legends. Later accounts depict him playing piano for prisoners, one of whom resurfaces in *Professor Layton and the Last Specter*. His musical motifs feature organ compositions, and select scenes omit his eyes in visual portrayals. Oswald’s tragedy lies in his duality: a devoted father whose grief propelled him into morally fraught choices, blending charm with a desperate resolve to immortalize his daughter.