Severus Snape significant person Lily Potter
Harry Potter and the Cursed Child
When Draco and Astoria Greengrass' son Scorpius Malfoy finds himself in an alternate timeline in which Voldemort won the Battle of Hogwarts, killed Harry and his allies and instituted a terrible reign of terror, he desperately searches for help in restoring history to its original course. He finds that in this reality Snape is still alive and still teaches at Hogwarts, and asks for his help. At first Snape is suspicious of him, since this timeline's version of Scorpius is a bully and a Voldemort stalwart. But when Scorpius shows that he knows of Snape having been in love with Lily, Harry's mother – Snape's most closely guarded secret – Snape becomes convinced that he does indeed come from a different timeline where Harry and his friends won. Snape then reveals that he, together with the fugitive Ron and Hermione Granger, maintain the last remnants of Dumbledore's Army – still waging hopeless resistance against the all-powerful Voldemort. In talking with Scorpius, Snape had learned that Harry would name his son "Albus Severus" and would regard Snape as "probably the bravest man I ever knew" – and is deeply moved. Though having guessed that in the other timeline he would die, Snape nevertheless willingly helps Scorpius recreate this timeline – and being discovered by Dementors, Snape sacrifices himself in order to cover Scorpius' escape.Loyalties
Snape's true loyalty was one of the most significant questions in the series up until the end of the final instalment, Harry Potter and the Deathly Hallows. Although the first five novels depict him as unfair and vindictive towards Harry and his friends, he invariably ends up protecting or otherwise helping them when they or their allies are in danger. Several characters express doubts about his loyalty, but Dumbledore's trust in him is generally taken to be the final word. Curiously, the same thing appears to happen in the opposite side, when we see how Bellatrix Lestrange mistrust Snape and only the word of Voldemort seems to protect him from the suspicions of the other death-eaters. The sixth novel, Harry Potter and the Half-Blood Prince, departs from that model. In the second chapter, Snape claims to have been working for Voldemort ever since the latter's return, and only pretending to help Dumbledore. By killing Dumbledore toward the end of the novel, Snape seems to place himself firmly in Voldemort's camp. Rowling maintains this impression through the early chapters of the seventh novel. However, near the climax of the book, Snape leaves Harry his dying thoughts (to be viewed in the Pensieve) and ultimately reveals to Harry that he had been loyal to Albus Dumbledore throughout the series. Snape's fierce devotion to and love of his childhood friend Lily, Harry's mother, is the foundation of that loyalty.After Harry Potter and the Half-Blood Prince, Snape's loyalty was a matter of intense debate among the fans. The issue was given special attention in the marketing campaigns on behalf of the last book, Harry Potter and the Deathly Hallows. "Is Snape Good or Evil?" was one of the questions in Scholastic Inc.'s seven-question series, part of its marketing campaign for the book. As part of the Waldenbooks marketing campaign, two free stickers, one that said "Trust Snape" and another that stated "Snape Is A Very Bad Man" were available with the book. Borders Group published a separate book on the topic, The Great Snape Debate, containing essays and arguments from both sides of the debate.