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Remus Lupin, also known as Professor Lupin, is a character in the AVPM series. He features in A Very Potter Sequel and A Very Potter Senior Year.
He is a werewolf and an alcoholic, and was a teacher at Hogwarts before getting fired. Lupin is a struggling man and occasionally vulgar, but tries (and fails) not to swear around kids. He is played by Brian Holden.
A Very Potter Sequel[]
Lupin is sleeping in a compartment in the Hogwarts Express, holding a hip flask and using a copy of the Daily Prophet as a blanket. He continues to be unconscious for most of the scene as Harry Potter, Ron Weasley, and later Hermione Granger walk in. When the Candy Lady is being impersonated by a Death Eater who nearly kills the Golden Trio, Lupin suddenly wakes up and initially attempts to use Expelliarmus on them, but when the spell fails he violently tackles the Death Eater until they run away.
Apart from being the Defense Against the Dark Arts teacher, he is the coach of the Gryffindor Quidditch team, "the most ancient and silliest of all Wizarding sports," as he says. He tells Harry that he used to play quidditch with his father, James Potter, and that he was James' best friend. However, Harry believes Sirius Black to be his father's best friend. Lupin concludes that it must have been hearsay.
During "Hermione Can't Draw," Lupin tells his students that the song is mean, causing them to change the lyrics to "Lupin can't sing." Then Remus puts Hermione back in the spotlight so the song goes away from him.
When all the students except Harry go on a field trip to Hogsmeade, Lupin gives him the marauder's map so he can go to Hogsmeade. The map shows the current location of everyone inside Hogwarts, and also has all the secret passages out of the castle. He also warns Harry not to go to the Shrieking Shack, where he turns into a werewolf. Harry, however, does not hear him well. So when Lupin appears transformed, he is called by different names: a vampire, a robot... but never a werewolf.
Before the quidditch match, Professor Lupin is found by Rita Skeeter and Neville Longbottom in his underwear, soaked in blood, and lying next to a dead doe. To cover up the situation, he makes up that it is a tradition for the Gryffindor team to kill and eat a defenseless doe before a quidditch match to absorb the power and ferocity of a doe. Then, he forces Neville to eat some of the doe.
Their quidditch team ends up winning for the first time in 14 years. Everyone celebrates this win, and Ron offers Lupin a Bertie Bott's Flavor candy bean. Unfortunately, he gets the taste of poop. Rita Skeeter makes sure that everyone finds out so she makes it an article for the Daily Prophet.
Remus Lupin teaches his class to cast the Expecto Patronus spell to protect themselves from dementors. In order to do so, the caster must think of a happy memory. Lupin says he thinks of James Potter when casting it. Professor Umbridge bursts into class and fires him for teaching material that is not in the syllabus and for 'eating shit.' Professor Snape makes fun of him for being fired and Lupin apologizes for making fun of him all those years.
Harry Potter says goodbye to Remus Lupin, telling him that he was his favourite teacher. Lupin drinks alcohol and tells Harry that he has already taught him everything he had to teach him, and that his last lesson was how to get himself fired.
Professor Umbridge imprisons Sirius and sentences him to death by the way of Dementor's kiss. The kids save him and he, with Lupin, explains that the actual traitor and killer of Harry's parents is Peter Pettigrew, who has disguised as a Taylor Lautner poster holding a football.
When Sirius Black discovers that Lupin believed himself to be the best friend of James Potter, Harry's father, he says that the only way to settle that disagreement is for them to become best friends. Lupin accepts, happily: "That's all I ever wanted." Then they hug and Sirius kisses his head.
Peter Pettigrew ends up running away, but Lupin hunts and kills him in his werewolf form. When questioned as to why he is covered in blood, Lupin claims it is from a jaguar attack, Neville Longbottom dictates that Peter has been dead for ten minutes and 36 seconds, proving Sirius Black's innocence. How could Sirius have killed him years ago if he's only been dead for ten minutes?
Harry gives his Firebolt and wallet to Sirius to travel the world and he flies away with Lupin, who is still in white briefs, covered in blood and with a gun on his underwear.
In "Days of Summer," both Lupin and Sirius reappear, hugging each other by the shoulder. They kiss, and then sing and dance with the rest of the cast.
A Very Potter Senior Year[]
Lupin is temporarily revived by the Resurrection Stone and sings "Everything Ends" along with James Potter, Sirius Black, Lily Potter, Cedric Diggory and Severus Snape. Lupin still looks the same as when he ran away with Sirius: in his underwear and covered in blood. Although this time he doesn't have a gun.