Haruki Shirogane is a cunning and shrewd Congressman in the secret organization Bifrost, participating in its high-stakes holo game, Roundrobin. His name, combining characters for "distant," "bright/prosperous," and "payment," reflects thematic elements. He possesses extensive familiarity with Roundrobin's rules, operations, and tangible effects on real-world events.

Appearing in his 70s, Shirogane has an average height and slender build. Gray hair swept back frames his face, complemented by a gray balbo beard and dark brown irises. He typically wears formal attire: a gray suit, ivory dress shirt, and blue bowtie.

Highly calculating, Shirogane exercises patient strategy, biding his time before executing decisive moves within Bifrost's power struggles, including eliminating allies who threaten his objectives. He maintains a long-standing acquaintance with fellow Congresswoman Kyoko Saionji. While harboring no personal hatred, he acts decisively to remove her from Roundrobin upon discovering her duplicity, viewing her betrayal as a threat to the organization's stability. He expresses admiration for Congressman Shizuka Homura, valuing Homura's sharp intellect and manipulative capabilities which align with Bifrost's operational ethos.

Shirogane rose to Congressman through demonstrated skill in Roundrobin. His involvement continues through the events of *Psycho-Pass 3: First Inspector*, where he persists as an active Congressman.