Lucy McClain serves as Ryan Gladstone's composed and professional assistant within the DREAM organization, ensuring operational efficiency alongside secretary Mathew while maintaining a neutral, expressionless public demeanor. She sports distinctive pink hair and blue eyes behind half-rim glasses, typically clad in a blue uniform with white and pink stripes. Secretly, she operates as Leader B, the aggressive and condescending commander of the antagonistic Dominators. In this role, she sheds her composure for overt aggression, unrestrained laughter, and independent action, sharing responsibility with Mathew for training Dominators members. As Leader B, she spearheads the Dominators' efforts to seize control of the BeyWheelz world, challenging Team Estrella through orchestrated attacks and participation in the fate-deciding Judgement Bey tournament. Her actions drive the central conflict from the shadows while preserving her DREAM cover. Significant developments unfold across episodes like "The Shocking Truth," where her dual identity faces exposure, "The Wheeler Bond," and the concluding "A New World."