Cornelius Fudge

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• Scamander, Newt – Student expelled from Hogwarts who excels at curing diseases. Magizoologist and author of Fantastic Beasts and Where to Find Them.
• Scrimgeour, Rufus – Head of the Auror Office who replaces Cornelius Fudge as Minister for Magic. Killed by Death Eaters. Bill Nighy played Scrimgeour in Harry Potter and the Deathly Hallows – Part 1.
• Shacklebolt, Kingsley – Auror and bodyguard for the Muggle Prime Minister. Helps organise members of the Order of the Phoenix and fights during the Battle of Hogwarts. After Voldemort's death, Shacklebolt becomes Minister for Magic. Kingsley is portrayed by George Harris in the Harry Potter films.
• Stan Shunpike – Assistant conductor of the Knight Bus. Placed under the Imperious Curse by Death Eaters during Voldemort's second rise to power to do some work for them. Lee Ingleby portrays him in Harry Potter and the Prisoner of Azkaban.
• Skeeter, Rita – Reporter and tabloid journalist for the Daily Prophet and an unregistered Animagus. There was speculation that the attention given to Harry Potter by the press was the inspiration for Skeeter, but Rowling explained in a 2000 interview that she developed the character before the success of the novels. Skeeter is portrayed by Miranda Richardson in the Harry Potter films.
• Slughorn, Horace – Former Potions professor and Head of Slytherin House who returns to teaching for Harry's sixth year. He formerly taught Voldemort and indirectly led to his rise in power by teaching him about Horcruxes. He operates an exclusive social club with chosen students named the Slug Club. Portrayed by Jim Broadbent in the film adaptations of Half-Blood Prince and Deathly Hallows – Part 2.
• Slytherin, Salazar – One of the four founders of Hogwarts, and the founder of Slytherin House. He was a Parselmouth, an accomplished Legilimens, and a proponent of pureblood supremacy. According to Albus Dumbledore, Slytherin prized resourcefulness, determination, cunning and ambition in his students. He is described as power-hungry by the Sorting Hat. His relics include a locket that was later turned into a Horcrux by Voldemort.
• Smith, Hepzibah – Descendant of Helga Hufflepuff and owner of Hufflepuff's cup until she is killed by Voldemort, who uses her death to transform the cup into a Horcrux.
• Smith, Zacharias – Chaser for the Hufflepuff Quidditch team. He joins Dumbledore's Army but is sceptical of Harry's claims. He becomes the Quidditch commentator after Lee Jordan. Nick Shirm portrays Zacharias in the Order of the Phoenix film and voices the character in the video game.
• Snape, Severus – Hogwarts professor of Potions and later Defence Against the Dark Arts. Head of Slytherin House. Member of the Order of the Phoenix and a spy for Albus Dumbledore among the Death Eaters. Headmaster of Hogwarts when the Death Eaters take control of the school. Killed by Voldemort.
• Spinnet, Alicia – Gryffindor Quidditch Chaser two years above Harry and member of Dumbledore's Army. She returns to the school for the Battle of Hogwarts. Alicia is portrayed by Leilah Sutherland in Philosopher's Stone and by Rochelle Douglas in Chamber of Secrets.
• Sprout, Pomona – Hogwarts Herbology professor and Head of Hufflepuff House. Portrayed by Miriam Margolyes in the Harry Potter films.