Hagrid
Background
Rubeus Hagrid is the keeper of keys and grounds at Hogwarts School of Witchcraft and Wizardry. He has a pet dog named Fang. Hagrid was expelled from Hogwarts as a student when Tom Riddle accused Hagrid's pet, Aragog of killing a student. His half-brother is Grawp.
During the events of Harry Potter and the Sorcerer's Stone (2001) played by Robbie Coltrane
Albus Dumbledore uses his delluminator to capture the light from the streetlamps on Privet Drive. Professor McGonagall transforms from a cat and shortly after, Hagrid arrives on his flying motorcycle and hands Harry Potter to Dumbledore and he leaves a note to Aunt Petunia Dursley and Uncle Vernon Dursley. The Dursley's go to a remote shack to live to avoid receiving mail and on Harry's 11th birthday, Hagrid shows up and gives Harry a birthday cake. Hagrid introduces himself to Harry and tells Harry he is a wizard, before handing Harry his acceptance letter from Hogwarts. Uncle Vernon tells Hagrid, Harry will not be going to Hogwarts and Aunt Petunia insults Harry's mother Lily Potter. Uncle Vernon insults Dumbledore and Hagrid makes Dudley Dursley grow a pig tail when he sees Dudley eating Harry's birthday cake. Hagrid and Harry then leave and go to London. Hagrid and Harry go into the Leaky Cauldron and Hagrid introduces Harry to the Bartender in Leaky Cauldron and Professor Quirrell. They leave through the back of the Leaky Cauldron and Hagrid taps the brick wall with his umbrella and after the bricks form a door, they enter Diagon Alley. They go to Gringotts Bank and Hagrid tells Goblin Bank Teller that Harry wishes to withdraw some money. Hagrid hands the Goblin Bank Teller Harry's key and a top secret letter from Dumbledore addressed to The Head Goblin in charge of all Goblins at Gringotts Bank. Griphook takes Harry and Hagrid to Harry's vault and then they go to vault 713 and Hagrid picks up something bundled in cloth. They travel to Ollivanders and Mr Ollivander helps Harry find the right wand for him. Hagrid knocks on the store window and shows Harry his birthday present, Hedwig. Hagrid tells Harry the story of Voldemort and how Harry's parents Lily Potter and James Potter stood up to Voldemort, but were eventually killed by him. Hagrid tells Harry he has to leave and hands him a ticket from London to Hogwarts by way of Platform 9 3/4. In school, Harry, Hermione Granger and Ron Weasley tell Hagrid they think Professor Snape was trying to curse Harry and tell him they think he is trying to steal whatever is hidden in the room with Fluffy, but Hagrid tells them not to meddle in places they don't belong and accidentally mentions the name Nicholas Flamel. After they figure out who Nicholas Flamel is, Harry, Ron and Hermione go to Hagrid's hut and tell him they know about the Sorceror's Stone. They tell him they think Snape is trying to steal the stone, but Hagrid tells them he is one of the professors protecting it. As they are talking to Hagrid, Fang starts sniffing Ron's face. Hagrid pulls out a dragon egg, which hatches into a Norwegian Ridgeback dragon, which Hagrid names Norbert. For detention for being out past curfew, Harry, Hermione, Ron and Draco Malfoy are brought by Mr Filch to help Hagrid in the Dark Forest. Hagrid tells them Dumbledore made him send Norbert to Romania. They follow Hagrid and Fang into the forest and find unicorn blood and Hagrid tells them he found one dead a few weeks ago and their goal is to find the wounded unicorn. They split up and Harry and Draco go with Fang. By accident Hagrid reveals the trick to get past Fluffy. As Harry is leaving for the semester, Hagrid gives him a photo album with a photo of Harry as a baby with his parents.
During the events of Harry Potter and the Chamber of Secrets (2002) played by Robbie Coltrane and Martin Bayfield
Hagrid sees Harry in Knockturn Alley and saves him from the Aged Witch and the others and tells Harry he was looking for Flesh Eating Slug Repellent. Hermione runs up to Harry and Hagrid and greets them and fixes Harry's glasses. After Ron's spell backfires, Harry and Hermione take Ron to Hagrid's hut who asks why Ron tried to curse Draco. Hermione tells Hagrid, Draco called her Mudblood. After Harry is accused of petrifying a student, Hagrid barges into the room and tells Dumbledore, Harry is not the guilty one. Dumbledore tells Harry he doesn't believe it was him that opened the Chamber of Secrets. Later, Harry and Ron sneak to Hagrid's hut using the cloak of invisibility and knock on the door. Hagrid lets them in and as they ask Hagrid about the Chamber of Secrets there is a knock on the door. Ron and Harry get underneath the cloak and Hagrid lets Dumbledore and Cornelius Fudge come inside. Cornelius tells Hagrid that he will have to take Hagrid to Azkaban due to the attacks on the students. Lucius Malfoy walks in and tells Dumbledore the governors have decide it is time for Dumbledore to step aside as Headmaster of Hogwarts. As Hagrid is leaving with Cornelius, he mentions to follow the spiders and someone will have to feed Fang. Hagrid returns from Azkaban and personally thanks Harry, Ron and Hermione and everyone gives Hagrid a round of applause.
During the events of Harry Potter and the Prisoner of Azkaban (2004) played by Robbie Coltrane
Before their feast, Dumbledore introduces the students to Professor Lupin. Dumbledore announces that Hagrid will be teaching the Care of Magical Creatures course. Dumbledore then warns the students not to get in the way of the Dementors. Hagrid takes the class to the woods and introduces the students to Buckbeak as they stare in wonder, including Girl 1 and Boy 2. Harry is chosen to be the first student to interact with Buckbeak and Harry manages to make friends with Buckbeak and Buckbeak lets Harry ride on him. Buckbeak lands back on the ground and Draco arrogantly pushes the other students out of the way and walks up to Buckbeak, who attacks him and Hagrid is forced to take Draco to the hospital. Hermione, Harry and Ron go to ask Hagrid how the inquiry into Buckbeak's attack on Draco went and he tells them that Buckbeak has been sentenced to death. On the day of the execution, they go to Hagrid's shack and Hermione offers to stay with him during the execution. Hagrid then gives Ron, Scabbers, which he found. Suddenly rocks are thrown into the shack and Harry sees Dumbledore, Fudge and The Executioner walking up and he, Ron and Hermione leave. When Hagrid, Dumbledore, Fudge and The Executioner leave the hut, Fudge finds Buckbeak missing, and The Executioner chops a pumpkin in anger. Dumbledore tells Fudge they obviously can't blame Buckbeak missing on Hagrid since he was with him.
During the events of Harry Potter and the Goblet of Fire (2005) played by Robbie Coltrane
Neville Longbottom and the other students stare in awe as Hagrid directs a carriage being pulled by seven pegasus as it lands on the school grounds. The students, including Nigel, then watch as a large ship rises out of the water. Dumbledore tells the students that Hogwarts will be hosting the Triwizard Tournament. Dumbledore introduces Madame Olympe Maxime and the students of the Beauxbatons Academy of Magic, including Fleur Delacour. He then introduces Igor Karkaroff and the students of Durmstrang, which includes Viktor Krum. Dumbledore introduces Maxime to Hagrid, who accidentally stabs his fork into the palm of Professor Flitwick. The Goblet of Fire is brought into the hall and Dumbledore tells the students that whoever wins the tournament will have eternal glory. Alastor "Mad-Eye" Moody walks into the hall and is greeted by Dumbledore. Later, Harry meets with Hagrid who tells him to use his Cloak of Invisibility. Hagrid then meets with Maxime and shows her the dragons that will be used as the first challenge. Hagrid tells Harry that Ron saw the dragons when he was visiting his brother Charlie, who had brought the dragons from Romania.
During the events of Harry Potter and the Order of the Phoenix (2007) played by Robbie Coltrane
Harry, Hermione and Ron run to Hagrid's cabin and an injured Hagrid tells them Dumbledore sent him to try and get the giants on their side and then feeds Fang the steak he was using to stop his wounds from swelling. He takes Harry, Hermione and Ron to meet his half-brother, Grawp. Grawp takes a liking to Hermione and picks her up, until she orders him to put her down and then gives her a bike handle with a bike bell. He then asks them to watch over Grawp for him while he is away.
During the events of Harry Potter and the Half-Blood Prince (2009) played by Robbie Coltrane
Tthe Hogwarts train stops at the station and Hagrid greets the students as they get off the train. Dumbledore introduces the students to Professor Horace Slughorn and tells the students that dark forces are trying to penetrate Hogwarts. Leanne and Katie Bell are walking back to Hogwarts when Harry, Ron and Hermione hear Leanne scream. Katie flies into the air and then falls back down. Hagrid tells the children to stay away from Katie and picks her up and takes her back to Hogwarts. Harry and Slughorn walk over to Hagrid's hut and find Hagrid mourning the death of Aragog. Hagrid, Harry and Slughorn go inside Hagrid's hut and sing songs and drink as Fang howls.