A house-elf who, three years ago, Harry freed from service to the Malfoy family. Dobby now works in the Hogwarts kitchens as a happily free elf and idolizes Harry. He loves clothes and is the only elf willing to clean the Gryffindor common room, given that Hermione leaves hats around in the hopes of freeing elves. Dobby tells Harry about the Room of Requirement and for Christmas, decorates the room with decorations bearing Harry's face. He later disobeys Umbridge to warn Harry and the D.A. that they've been found out.
Dobby Character Timeline in Harry Potter and the Order of the Phoenix
The timeline below shows where the character Dobby appears in Harry Potter and the Order of the Phoenix. The colored dots and icons indicate which themes are associated with that appearance.
...the Room of Requirement for the final D.A. meeting before the holiday, he discovers that Dobby decorated the room with pictures of Harry's face. Luna arrives just as Harry takes the... (full context)
...He introduces Patronuses one night and several students, including Seamus, experience success conjuring them. Suddenly Dobby enters the room, looking terrified. Harry ascertains that Umbridge found about the D.A. and sends... (full context)