Hidenori Danno commands as leader of "Beast," Hiroshima's undisputed top delinquent group. His gang reigns supreme over rivals like Hiro's "Hiroshima Nights" and Tsukasa Kiriki's "Gokurakuchou." Beast's strength, numbering roughly 3,000 members, reflects Danno's deep authority within the region's hierarchy.

Danno possesses a stoic and reserved demeanor, his imposing presence commanding silent respect from both subordinates and rivals. He leads through quiet control rather than overt aggression, cementing his reputation as a formidable, calculating figure. After securing Beast's dominance, Danno entered a phase of disillusionment, marked by boredom and detachment from the conflicts that once drove him. This disengagement shifted only with the rise of Tsukasa Kiriki as a significant rival, reigniting Danno's competitive fire and pulling him back into the delinquent fray.

He operates by a strict personal code of honor, prioritizing unwavering loyalty to his gang and adherence to his principles amidst the turbulent rivalries. His story explores themes of societal expectations and identity, highlighting the tension between the external criminal perception of delinquents and his own internal sense of integrity. His character development centers on his response to challenges against Beast's supremacy and his evolving views on leadership and conflict.

In the film adaptation, Danno remains one of the three major forces in Hiroshima's delinquent scene, alongside Hiro and Tsukasa. The shifting balance of power between these groups forms a central narrative element.