Neville Longbottom

Neville Longbottom is a Gryffindor student who is in Harry's year, described as round-faced and "short and plump and blond".[9] Throughout the series, Neville is often portrayed as a bumbling and disorganised character, and a rather mediocre student, though he is highly gifted at Herbology. Neville is the son of Frank and Alice Longbottom, who were Aurors and members of the Order of the Phoenix until they were tortured and permanently incapacitated by a group of Death Eaters led by Bellatrix Lestrange. For this reason, Neville was raised by Augusta Longbottom, his paternal grandmother. Neville plays a minor role in the first four books of the series; however, Rowling wanted Neville to do something brave in Harry Potter and the Philosopher's Stone, in which Neville "finds true moral courage in standing up to his closest friends - the people who are on his side" towards the climax of the book.[10]
According to Rowling, Order of the Phoenix "was a real turning point for Neville", due to the bigger role he played in that book.[11] His magical abilities improve dramatically during meetings of the D.A. Harry comes to understand him on a deeper level, beginning when Harry's friends learn about the fate of Neville's parents at St Mungo's. In the climax of the book, Neville participates in the battle in the Department of Mysteries, in which he accidentally breaks the glass sphere containing a prophecy about Harry and Voldemort.[12] Dumbledore, to whom the prophecy was originally made, explains that it concerns "the Chosen One", a wizard that would have the power to vanquish Voldemort and that would be born "as the seventh month dies" to "parents who have defied the Dark Lord thrice"; thus could refer to either Neville, born July 30, 1980, or Harry, born July 31.[13] Neville receives a new wand in Harry Potter and the Half-Blood Prince, his old wand - inherited from his father - having been broken during the struggle with Death Eaters during the battle in the Department of Mysteries. During the train ride to Hogwarts, Neville receives his first (and only) invitation by Horace Slughorn to join his "Slug Club". Neville wants the D.A. meetings to continue, because he feels they have helped him and others to improve their skills. Harry does see a need any more since they have a proper Defense against the Dark Arts teacher. When a group of Death Eaters guided by Draco Malfoy attack the castle, Neville answers the call for help, and he fights against the Death Eaters once again, though he suffers minor injuries.
With Harry's absence and the control of Hogwarts in the hands of Snape and Death Eaters Alecto and Amycus Carrow in Harry Potter and the Deathly Hallows, Neville spends much of his seventh year at Hogwarts as the resistance leader against Voldemort's takeover. Together with Ginny and Luna, Neville reactivates Dumbledore's Army, helping students who are tormented under the new regime. Neville reveals that the Carrows beat him and that the Death Eaters tried to target his grandmother when Neville was acting up at school. Neville goes into hiding in the Room of Requirement, which he shows an incredible ability to control. Upon Harry's return to Hogwarts, Neville sends messages to the D.A., which in turn gathers the Order of the Phoenix. During the Battle of Hogwarts, he is spotted twice by Harry using his knowledge of Herbology to help ward off the attackers. He is later seen helping Oliver Wood carry the body of Colin Creevey. He is instructed by Harry, before leaving to the forest, to kill Voldemort's snake Nagini.[14] When Voldemort returns with Harry's apparently lifeless body, Neville defies him, and decapitates Nagini with the Sword of Godric Gryffindor drawn from the Sorting Hat, thus destroying the final Horcrux. In the ensuing conflict, he is shown assisting Ron in taking down Fenrir Greyback. After the battle is won, Neville is shown surrounded by a group of admirers.
In the epilogue of Deathly Hallows, Ginny mentions that Neville has gone on to be the Herbology professor at Hogwarts. In an interview, Rowling mentioned that he shows off his D.A. coin to many admiring students and tells them about his adventures.[1] Rowling also revealed that he married Hannah Abbott who became the landlady of the Leaky Cauldron.[15] The couple live over the pub, a fact that Rowling thought people would find "particularly cool".[16]
Neville has been played by Matthew Lewis in all of the Harry Potter films to date.