Biddle Coleridge was a Human male in the 21st century on Earth. Coleridge was a resident of Sanctuary District A in San Francisco. Within the Sanctuary Coleridge, or B.C., was a "ghost" with a tendency toward violence and thievery.
Coleridge was a leader of a group of ghosts who attacked and captured the processing center for the District in 2024 as part of the Bell Riots. Several times during the siege Coleridge came close to attacking the hostages and it was only through the intervention of Starfleet officers Benjamin Sisko and Julian Bashir, who had become trapped in the past, that the hostages were spared.
Coleridge hoped to bargain the hostages for his release from the Sanctuary District and travel to Tasmania, home to his idol, Errol Flynn, but he was killed when government forces stormed the building to free the hostages. (DS9: "Past Tense, Part I", "Past Tense, Part II")