Fan Casting James Potter and the Memory Diamond

It's James Sirius Potter and his siblings and cousins 1st year at Hogwarts School of Witchcraft and WIzardry and their parents and relatives, Harry and Ginny Potter, Ron and Hermione Granger Weasley, George and Angelina Weasley, Bill and Fleur Weasley and Percy and Audrey Weasley are working for the Daily Prophet and the Ministry of Magic. Things have changed so far: Fluffy's released in the Forbidden Forest, Draco Malfoy's wife, Astoria Malfoy had been killed by new Death Eaters, Minerva McGonagall is the new Hogwarts headmistress, Neville Longbottom is the new Herbology teacher, Luna Longbottom is the new matriach, Harold Alcurn is the new Defense Against the Dark Arts teacher, Susan Bones is the new Flying Lessons Instructor, Michael Corner is the new Muggle Studies Teacher, Zacharias Smith is the new Charms teacher, Ernest MacMillian is the new Potions teacher and Roger Davies is the new Transfiguration teacher, but Lily Potter I, James Potter I, Cedric Diggory, Sirius Black, Albus Dumbledore, Fred Weasley I, Remus Lupin, Mad Eye Moody and Nymphadora Tonks are now ghost figures just like Sir Nicholas, Moaning Myrtle and the Bloody Baron. Then 1 dark and creepy evening, a new evil wizard named Lord Keeling and an evil witch lady named Lady Delphini have arrived in the shadows of darkness and a new set of Death Eaters and Dementors and other evil critters have appeared as well. James must go on a mission quest to find the memory diamond.