Dennis Aldermaston was a Ravenclaw student at Hogwarts School of Witchcraft and Wizardry in the 1990s. He was usually seen spending time at the Library during the 1996-1997 school year. Preferring to work with Rubeus Hagrid, Dennis didn't like to study. His hero was Gilderoy Lockhart. In 1996 he wanted a new broomstick, which he hoped to receive from his mother at Christmas. At some point in his life he used Skiving Snackboxes.