The Creevy Brothers are a pair of Muggle-born Gryffindors that are huge fans of Harry Potter. They are minor characters in the books and movies and are Members of Dumbledore's Army.
Colin Creevy is minor protagonist, being a huge fan of Harry Potter. He is at times annoying to Harry Potter and brought in a camera to take pictures at Hogwarts, being Muggle-born he didn't know cameras were non-existent in the magical world. He appears in Harry Potter and the Chamber of Secrets, Harry Potter and the Prisoner of Azkaban, Harry Potter and the Goblet of Fire, and Harry Potter and the Order of the Phoenix. In the Chamber of Secrets, he has a major role, being sorted and taking pictures in classes, annoying Harry. In the Prisoner of Azkaban, he says hello to Harry once. In the Goblet of Fire, Dennis is sorted into Gryffindor and Colin cheers. In the Order of the Phoenix, he and Dennis join Dumbledore's Army. In the Deathly Hallows, Colin is mentioned to be killed by a death eater in the Battle of Hogwarts.
Dennis Creevy is an extremely minor character, being sorted into Gryffindor in the Goblet of Fire, and in the Order of the Phoenix is a member of Dumbledore's Army. He is Muggle-born and disliked by the pureblood Slytherins.