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Marked since 2011-06-27 because: Sunshine's appearances in each mission should be listed in the biography section and the specific mission/cutscene names used as references. The events from Burning Down the House, Bad Trip, Bonding Experience are missing
Mr. Sunshine is The General's right hand man and the Sons of Samedi's second in command. He is incredibly devoted to The General, who calls him "friend", but he and Veteran Child hate each other. He is a violent man when prompted, slashing an innocent bystander in a music store to clear the place out and shooting an addict who wants to buy the drugs from the 3rd Street Saints, sparing Veteran Child's life only on The General's order. He finds the burning of Shivington "beautiful". He often carries a machete as his weapon of choice and a sceptre made from a wooden shaft topped with a skull on top and ending in a spike.
He possesses some kind of Voodoo Power while holding a Voodoo Doll, as is able to become immortal and send The Protagonist flying without even touching them while manipulating the doll. 
Sunshine helps intimidate Veteran Child into admitting he'd given information to Shaundi.  After the loss of Shivington to the Saints, Mr. Sunshine takes a more direct role  and arranges for The Protagonist to be abducted. Unfortunately for him, The Protagonist escapes but not before, concussed and stoned, they tell Mr. Sunsine they don't find him scary. 
After further failures, The General cuts his left ear off as punishment. Mr. Sunshine accepts this and assures The General "I only need one ear to hear the whispers of the Loa".  He later enlists multiple addicts to attack the Drug Factory, swearing they can keep all the drugs for themselves. The Protagonist goes gunning for him in revenge, attacking him at his hideout in the meat packing plant. In a display of supernatural power, Mr. Sunshine survives and continues to fight after being shot multiple times in the chest. Annoyed, The Protagonist empties an entire magazine into him and finally beheads him with his own machete, before chucking his decapitated head onto a conveyor belt.
Afterwards, people around Stilwater (including Shaundi) wonder if he's really dead or might come back.
Mr. Sunshine has a high pain tolerance, willingly allowing his ear to be cut off without making any noise indicating pain, although he clenches his fist, showing he does feel it and that he bleeds.
Mr Sunshine act a lot like the fictional drug lord King Willie from the movie Predator 2 and even Sunshine's death bares a resemblance.
He may also be a reference to Baron Samedi, the James Bond villain, who also has occult abilities and seems immortal.
Mr. Sunshine shares similarities with Jyunichi. Both are young men who are second-in-command and chief enforcers of their gangs and specialize in bladed weapons. Both also are very close to their leaders (The General and Kazuo Akuji, respectively) and meet their ends by blades as well as someone snitching on them.