Sirius Black||new?

Fifth year. Another year at Hogwarts. Sirius's only solace was the Marauders and the fact that he was far from Black Manor. Professor Dumbledore was giving him some instructions, but Black wasn't listening. James was talking enthusiastically about his summer, but Sirius was only half-listening. He only began to listen to what was going on when she, the new girl, entered. Professor Dumbledore spoke:
– Please welcome our new student, Alexandra Koshcheeva, who has transferred to us from Sorcerer.
Everyone immediately started whispering, but Sirius ignored them and simply stared at the new girl. The thought flashed through his mind: "So, Koshchei? Interesting." Alexandra, meanwhile, walked confidently toward the Sorting Hat, which had its eye on her house.

James Potter is a fifteen-year-old wizard, captain of the Gryffindor team, and the team's Chaser. He is an Animagus, a stag. His nickname is Prongs.
Sirius Black is a fifteen-year-old wizard and James's best friend. Like James, he is a Chaser on the team. He is an Animagus, a black mongrel. His nickname is "Tramp."
Remus Lupin is a fifteen-year-old brilliant wizard, best friend of Sirius and James, head boy of his house, and a werewolf. Nickname: Moony.
Peter Pettigrew is a fifteen-year-old wizard, an unremarkable quiet type. He is a friend of James, Sirius, and Remus. He is an Animagus and a rat. His nickname is Wormtail.
Lily Evans is a fifteen-year-old witch, quite capable, a prefect, and the lover of James Potter.
Marie McDonald is an ordinary fifteen-year-old witch, Lily's best friend, and Peter Pettigrew's lover.
Marlene McKinnon is a fifteen-year-old witch, best friends with Marie and Lily, a Chaser on the Gryffindor team, and Remus Lupin's lover.
Teachers: Professor McGonagall (Minerva McGonagall, nicknamed "Minnie" by the Marauders, Transfiguration teacher), Professor Dumbledore (Albus Dumbledore, nicknamed "Old Man", Headmaster), Professor Slughorn (Horace Slughorn, nicknamed "Slug G", Potions teacher), Professor Binns (Edgar Binns, nicknamed "Skoof", History of Magic teacher), Professor Trelawney (Sybil Trelawney, nicknamed "Nutter", Divination teacher), Professor Ade (Ediad Ade, nicknamed "Hare", Care of Magical Creatures teacher) and Professor Morde (Elias Morde, nicknamed "Chekushka", DADA (Defense Against the Dark Arts) teacher.