James Alexander Potter (b. March 27, 1960) is a wealthy Pure-blood wizard, the only son of elderly parents Alexander and Grace Potter. He attended Hogwarts School of Witchcraft and Wizardry from 1970 to 1977, where he was sorted into Gryffindor and became an unregistered Animagi with the ability to transform into a white stag (earning him the nickname "Prongs"). He, like his wife Lily, is a canon character in the Harry Potter books.
James, from Chapter 2, is described as tall, black-haired, strong-jawed and straight-nosed. He is considered fairly attractive by the Hogwarts female population, carrying a casual air and perpetual crooked grin. James notes that he shares many of his mannerisms with his father, something that frustrates him.
His best friends are Sirius Black, Remus Lupin and Peter Pettigrew, whom he considers brothers. They are known as 'The Marauders' and take on the role of troublemakers within Hogwarts. James is closest with Sirius, although during the 'Snape incident' it had seemed for a while they were "at a point where they couldn't come back". Happily, they managed to reconcile and it only stood to strenghten their relationship. He also has a list of enemies, most (all) of which are Slytherins. James's main relationship in the story is Lily Evans, who he has liked since their First Year. The pair share a 'playfully meaningful' relationship full of dilema and conflict. Lily begins to reciprocate James' feelings at the begining of their Seventh Year, but at that time he is in a relationship with Carlotta Meloni. James and Carlotta work reasonably well together, and James likes that things are straight forward with her. However, he and Lily share something much greater, and when he and Carlotta break up, James doesn't seem to take it too hard.
James, as said by the summary, is dynamic and implusive. He has a tendency to pick fights and confrontation is his first instinct. He is fairly intelligent, has a good sense of humour, and is loyal to his friends. When muggleborn rights were being threatened he protested against the ministry. He doesn't let anyone stop him from doing what he wants.
After "The Life and Times"Edit
James presumably married Lily Evans soon after they graduated Hogwarts. They joined the Order of the Phoenix together, and according to the prophecy Trelawney made (the one Snape overheard), they had both been face-to-face with Voldemort three times before their death. James and Lily had their son Harry James the 31 of July, 1980. After Trelawney's prophecy James and Lily went into hiding with their son, using Sirius Black as their Secret Keeper. But Sirius made Peter Pettigrew the secret keeper at the last minute, believing they would have a higher chance of survival. However, Peter betrayed them, and handed them over to Voldemort. On Halloween 1981, Voldemort came to Godric's Hallow and murdered first James, then Lily, who left behind them the now orphaned one-year-old, Harry James Potter: the boy who lived.
Canon Divergence Edit
From the Harry Potter novels there is little known about James Potter. The physical description, and character description from The Life and Times do match what information JK Rowling provided us with.
However, The name James Alexander Potter was written as fanon by Jules, giving him a middle name after his father Alexander Potter. Alexander Potter doesn't exist, JK Rowling revealed in a pottermore post titled, "The Potter Family" the name of James' parents are Fleamont and Euphemia. James' middle name, according to canon is Fleamont.