Vincent Crabbe was a pure-blood wizard and a student in Slytherin House at Hogwarts School of Witchcraft and Wizardry. He was the son of Crabbe Sr., a known Death Eater. Throughout his time at Hogwarts, Crabbe, along with his constant companion Gregory Goyle, served as one of Draco Malfoy's thuggish henchmen. Though generally portrayed as unintelligent and lacking magical talent, Crabbe developed a surprising and dangerous affinity for the Dark Arts during the Second Wizarding War. His character arc culminates in his death within the Room of Requirement, where he lost control of a Fiendfyre curse, inadvertently destroying one of Lord Voldemort's Horcruxes in the process.
Crabbe began his education at Hogwarts in 1991, the same year as Harry Potter, and was sorted into Slytherin House. From his first appearance on the Hogwarts Express, he established himself as a loyal, if dim-witted, follower of Draco Malfoy, readily joining in on the bullying of Harry Potter, Ron Weasley, and Hermione Granger. During his second year, Crabbe was a pawn in Harry and Ron's plan to discover if Malfoy was the Heir of Slytherin. Hermione Granger brewed a Polyjuice Potion, and Ron successfully used it to impersonate Crabbe after he and Goyle were fed cakes containing a Sleeping Draught. In his fifth year, Crabbe eagerly joined Dolores Umbridge's Inquisitorial Squad, a position that gave him official power to torment other students. Despite this, his academic performance was poor, and he was one of several students who had to retake their Defence Against the Dark Arts O.W.L. exam. During his sixth year, Crabbe and Goyle were tasked by Malfoy to act as lookouts while he worked to repair the Vanishing Cabinet in the Room of Requirement. To keep them from being discovered, Malfoy often used Transfiguration to disguise them, once transforming Crabbe into a small girl. Crabbe's most significant role came during the Battle of Hogwarts in his seventh year. Having learned powerful Dark Magic, he had grown more independent and defiant of Malfoy's authority. In the Room of Requirement, he confronted Harry, Ron, and Hermione, refusing Malfoy's order to capture Harry alive. He attempted to use the Cruciatus Curse and the Killing Curse before unleashing the powerful and uncontrollable Fiendfyre. The cursed fire consumed the room, killing Crabbe and destroying the Horcrux hidden there, Ravenclaw's Diadem.
Crabbe is consistently described as being very large and brutish. He was a hefty boy with a “pudding-bowl” haircut and long, gorilla-like arms. He typically wore a dull, thuggish expression. For most of his life, Crabbe's personality was defined by his subservience to Draco Malfoy. He was slow-witted, rarely spoke unless echoing Malfoy, and relied on physical intimidation over intellect. However, by his seventh year, a more sinister side emerged. He developed a clear taste for cruelty and the Dark Arts, showing a streak of malevolence that even unnerved Malfoy. His final actions reveal a reckless and arrogant individual, overconfident in his ability to control magic far beyond his skill level.
For most of his school career, Crabbe was a notably poor wizard. He struggled academically and demonstrated little magical aptitude.
In the film adaptation of Harry Potter and the Deathly Hallows – Part 2, the character of Crabbe is absent from the Room of Requirement scene. His role in casting the Fiendfyre and dying is given to Gregory Goyle. Blaise Zabini appears alongside Malfoy and Goyle instead of Crabbe. This change was reportedly due to off-screen legal issues involving the actor who played Crabbe, Jamie Waylett (film).