What happens when two teenagers who are supposed to not get along end up meeting A common ground. Rayne Potter is known for being James Potter's twin sister she's at the top of all her classes and is extremely outgoing and is friends with all the Marauders. But at the beginning of the 5th year, she goes into the wrong compartment everything changes and she meets the boy in all black. JK Rowling owns all harry potter except Rayne Potter my own character