Colin Creevey grew up in an ordinary Muggle family. He was the son of a milkman and he was amazed to find out he was a wizard. Colin was continually awestruck at everything to do with the wizarding world. Colin had a younger brother named Dennis, who was also a wizard, an unusual thing to occur for two magical off-springs to come from muggle parents.
— Colin requesting Ron be poised for a picture after vomiting slugs[src]
In his first year atHogwarts he was very frequently seen in Hogwarts with a camera, worshipping the ground that Harry walked on. At one point, he asked for an autographed photo of Harry, prompting Draco Malfoy to tell everyone Harry was giving out signed photos. Colin responded by accusing Malfoy of being jealous.
He got his photo, with the celebrity Defence Against the Dark Artsteacher Gilderoy Lockhart, however the photographic Harry refused to appear on the photo, despite attempts by the photographic Lockhart to drag him into view. When he went to Harry to have the photo signed, Harry was in a rush to get to Quidditch and tried to shake Colin off by claiming it was "boring".This lead to Colin asking Harry about first: the difficulty of flying, second: whether the Nimbus 2000 was Harry's broomstick, third: whether it was the best broom there was (in reality at the time it was the Nimbus 2001 but would later be replaced by the Firebolt) and finally the rules of Quidditch which Harry resigned to explaining. He then sat in the stands taking pictures of the training session, asking Harry at one point to look for a photo. Shortly after this, he also asked Harry about Ron's state of health after he had been accidentally self cursed (protecting Hermione from Malfoy). Upon seeing the state of Ron's condition, he eagerly and inappropriately asked Harry to turn him around. AfterMrs Norris was petrified, Colin told Harry a boy in his class had been saying what was presumably that Harry was the Heir of Slytherin. Colin next appeared at the Quidditch match between Gryffindor and Slytherin where he inappropriately took photos of Harry while he was lying injured in the mud. Shortly after this he was petrified bySalazar Slytherin's Basilisk. However, he was not killed by the snake's stare, because he luckily only saw it through the lens of his camera.
Colin's fourth year would be a year of rebellion amongst the students. The previous school year ended with the starting of the Second Wizarding War after Lord Voldemort returned andkilledCedric Diggory. However Harry Potter's claims that Voldemort had returned were slated as 'lies' and it wasn't officially announced to be true. Due to the events that took place in Colin's third year, in 1995, Dolores Umbridge was appointed as the eyes of the Ministry to watch over Hogwarts. However, Umbridge was far from what the students had in mind as 'watching over' them, she was a cruel and nasty teacher who refused to teach practical defensive spells to any students.
With students not being taught Defence Against the Dark Arts in a practical manner, Hermione Granger, Ron Weasley and Harry Potter founded an alliance called the D.A., which would help students to learn how to defend themselves. Colin and his brother both attended the first meeting of the D.A. and both expressed shock in learning what Harry had done during his school years, especially defeating the Basilisk that petrified Colin. Colin and his brother Dennis both joined this alliance, and during their meetings he and his brother were regarded as being erratic, causing several books to fly off bookshelves during practice. After three meetings, he managed to master the Impediment Jinx.
"Is it OK if I bring my camera? Oh wait, probably not we don't want photos of the secret meetings. I won't bring it then, great no problem, thanks again Harry I'll see you later, bye!"
—Colin Creevey to Harry Potter regarding the D.A. meetings[src]