HOUSE ELVES
!SPOILER WARNING! !SPOILER WARNING!
Dobby the house elf makes his first appearance in Harry Potter and the Chamber of Secrets also known as the second book.
He worked for the Malfoy family and was sent to Harry one day on his own accord.
He also always has the urge to injure and punish himself all of the time following the actions he does.
You have to tickle the pear on the door to conjure a handle leading to the kitchens (where Dobby works)
All the house elves work in the kitchens, including Winkie, (Barty Crouch Juniors old house elf)
There's a house elf called Creature who is trapped inside the descendant of Sirius Black's mother's house. He worked for Serious before he died at the hands of his cousin and Death Eater, Bellatrix Lestrange.
In the sixth movie, The Half Blood Prince he's forced to work for Harry after realizing that he has to obey Harry's commands.
He tipped Harry off in the second movie also known as The Chamber of Secrets that dangers await beneath the castle walls.
The only way to release a house elf from its work, masters and imprisonment is to give them clothes, any kind of material.
Winky's old master Barty Crouch junior was disguised as Mad Eye Moody in Harry's fourth year containing the Triwizard Tournament.
He put Harry's name into the goblet of fire, being able to enter the circle of over eighteen years of age. In the second challenge Harry gets stuck on what to do after Hermione and Ron are called into help by the Transfiguration teacher, Head Secretary to Hogwarts and the Head of House for Gryffindor.
Dobbie ends up helping him with what he overheard Barty Crouch Junior having a conversation, soon known to be fake, with Professor Mcgonagall to which leads Dobbie the answer to tell Harry.
Dobbie will go to any extent to help Harry no matter the consequences. This is because Harry was the one who set him free from the dreaded and vile Malfoys.
In the Order of the Phoenix Hermione intended to create a group following being nice to House Elfs. The name she chooses is S.P.E.W. It stands for…
The Society Of The Promotion Of Elfish Welfare.
Including this she also decides to teach Knit and Crochet knowing that the only way to set a House Elf free is to give them clothes. Fortunately Dobby decides to take them all where they are scattered and hidden, providing he can touch them because he is a free elf. Also the other slave House Elves are unappreciative to the clothes she hides, Dobby states that the find them most insulting.
Dobby also tries to stop Harry from entering Hogwarts in his second year. He does this by close to death results such as…
Stopping the barrier to board the Hogwarts train.
Tampering with the quidditch bludgers so that they would only target one person in the oncoming match (Harry.) This resulted in Harry losing all of the bones in his arm due to being hit in the arm by one then jinxed by “perfect” professor Lockhart resulting in the loss of all of his bones.
Dobby also informes Harry of the room of Requirement, telling him how to get inside and more but also yet telling him that Umbridge also known as horrible old hag or twisted gargoyle was tipped of by Marietta Edgecombe, (Cho Changs friend) later on saved by Dumbledore.
Last of all Dobby and Creature are loathsome to each other, as well as enemies.