Donquixote Rosinante, codenamed Corazon, was the younger brother of Doflamingo and a Marine commander working deep undercover inside the Donquixote Pirates. His effort to cure a dying boy named Law became the defining sacrifice of his short life.
Towering at roughly 293 centimeters, Rosinante stood only a little shorter than his even taller brother. His blonde hair was cropped short and shaggy, hanging close to sharp eyes of a reddish-brown shade, and his skin was pale. Drawn down each cheek were lines of dark red that stretched out from his lips, while a heavy blue eight-pointed star was inked over his right eye. He typically favored a crimson hood trimmed with dangling heart shapes, a dark feathered mantle echoing Doflamingo's, beige trousers, and a white shirt scattered with pink hearts, finishing the look with mismatched footwear and sunglasses.
The makeup and ornaments belonged to his pirate disguise. As a Celestial Dragon child his hair fell unkempt over his eyes, and after the family fled Mary Geoise he dressed in plain but tidy garments that grew ragged from a punishing life on the run. Years of beatings from townsfolk who despised the World Nobles left his body marked with scars and stitches. Once he enlisted with the Marines, he wore the standard cadet uniform stripped of the tattoos and paint of his spy persona.
Outwardly Rosinante played a brutish man who could not stand children, hurling Law through a window at their first meeting and roughing up Baby 5 and Buffalo whenever they pranked him. The cruelty was theater, a deliberate attempt to frighten youngsters away from following his brother. Beneath it he carried the gentleness he inherited from his father Homing, a kindness Doflamingo himself acknowledged. He wept for his dying mother and pleaded with his brother to spare their father, and he regarded Doflamingo as a creature born monstrous whose madness he felt duty bound to halt.
His supposed muteness was another mask. Believed unable to speak after an old accident and dismissed by Diamante as a dim, scatterbrained officer, he was in fact perceptive and intelligent, deceiving an entire crew while hiding his Devil Fruit. The single genuine trait was his clumsiness: he tripped constantly and repeatedly set his own cloak ablaze trying to light a cigarette. Forgiving by nature, he never reported Law for stabbing him, and his compassion drove him to defy both the pirates and prejudiced doctors to find the boy a cure.
Born the second son of Donquixote Homing after Doflamingo, Rosinante lost his World Noble status at age six when his idealistic father abandoned Mary Geoise to live among commoners. The family was hunted by vengeful townspeople, their mother died of illness in poverty, and two years later Doflamingo murdered Homing despite Rosinante's tearful pleas. Adrift and heartbroken, the boy was found by Admiral Sengoku, who raised him and brought him into the Marines, where he rose to commander. Fourteen years later he returned to his brother feigning silence, took the title of the second Corazon, and secretly reported the crew's black-market dealings while eating the Nagi Nagi no Mi, a Paramecia fruit that let him seal away sound.
Meeting the terminally ill Trafalgar Law, he came to pity the boy's despair and resolved to save him. After learning Law carried the initial D, he broke his silence to warn him and spirited him across the North Blue searching for treatment, burning down hospitals that turned the child away out of bigotry. When Doflamingo revealed plans to seize the Ope Ope no Mi, Rosinante stole it first and forced Law to eat it, curing the Amber Lead Syndrome. His treachery was exposed by Vergo, his predecessor as Corazon, and Doflamingo personally shot him dead. Clinging to life under his own silencing power so Law could slip away, Rosinante died smiling, and his sacrifice became the fuel for Law's lifelong vow to destroy Doflamingo.

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Donquixote Rosinante is the younger brother of Donquixote Doflamingo. He worked as a Marine commander secretly embedded within Doflamingo's crew under the codename Corazon.
Donquixote Rosinante stole the Ope Ope no Mi from his brother's crew and forced Trafalgar Law to eat it, curing the boy's Amber Lead Syndrome. Vergo exposed his betrayal, and Doflamingo shot and killed him, though Rosinante used his own Devil Fruit power to silence the scene so Law could escape.
Donquixote Rosinante acted like a brutish, child-hating man to keep youngsters away from his brother's crew, but the cruelty was an act. He was genuinely kind, forgiving, and willing to defy both pirates and prejudiced doctors to save Trafalgar Law's life.
Donquixote Rosinante was not Sengoku's biological son. His father was Donquixote Homing, but after Homing was killed, Admiral Sengoku found the orphaned Rosinante, raised him, and brought him into the Marines.
Donquixote Rosinante viewed his brother as a creature born monstrous and felt duty bound to stop him. When Doflamingo moved to seize the Ope Ope no Mi, Rosinante stole it first to save the dying Trafalgar Law, reporting the crew's crimes to the Marines the whole time as an undercover agent.
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