Ultraman Orb Dark is a dark, corrupted variant of Ultraman Orb that appears in Ultraman R/B. He is not a separate human character, but a sinister transformation used by the main antagonistic forces, reflecting power taken from Orb and twisted into a darker form. In the series, he serves as a threatening enemy presence and a visual symbol of stolen Ultra power, opposing the Rosso and Blu brothers during key conflicts.