Ichigeki Danpei is the son of Danjuro Ichigeki, a famed dodgeball player who abandoned his family, feigning death to travel the world. Danpei inherits his father's distinctive flame-shaped spiky red hair, a trait enduring through his life. His mother, former water polo pro Haruka Ichigeki, supports his athletic dreams while raising him alone and working as a swimming instructor. Despite his father's absence, Danpei remains haunted by his legacy, treasuring a dodgeball from his father's symbolic grave.

Danpei embodies the Determinator archetype, relentlessly chasing dodgeball mastery despite early failures, bullying, and harsh critiques of his skills. His energetic, combative, and outspoken nature fits the Fiery Redhead trope. He evolves into a Magnetic Hero, forging bonds with former rivals by understanding their struggles and championing their efforts. His core drive is honoring his father's legacy, specifically by mastering Danjuro's legendary "Flame Shot" technique.

His key relationships include childhood best friend Chin'nen Kobotoke, a calm, rule-abiding Blue Oni to Danpei's fiery spirit. Tomboysh kick specialist Misato Toudou, a fervent sports enthusiast, joins as team manager, offering support and occasionally deploying her powerful kicks in matches. Danpei also develops intense rivalries, notably with formidable competitor Taiga Nikaidō; their clashes fuel Danpei's growth.

Danpei's journey shows significant development. Initially seen as a troublemaker with poor teamwork, he matures into a disciplined, supportive teammate. His coming-of-age involves reconciling his father's abandonment; discovering Danjuro chose enlightenment over family leads Danpei to redefine his motivations beyond paternal emulation. His story concludes without a national championship win, yet he finds deep personal fulfillment through perseverance and camaraderie, solidifying his identity beyond his father's shadow.