Suit of armour

Suits of armour come in all shapes and sizes and are bewitched to move and talk. There are many suits of armour at Hogwarts School of Witchcraft and Wizardry. During Second Wizarding War, Professor McGonagall animated these armour to defend against oncoming Death Eaters. The shields of the suits of armour in the front row possess Shield Charm, during the war, Death Eaters tried to destroy these armour by simply using the Killing Curse, but their shields deflects all oncoming spell, therefore Death Eaters cannot defeat them easily, this is also why Lord Voldemort insists to ally with the Giants, so the Giants can take down the armour and statues easily.

History
In 1991 and 1992 some of them were bewitched by an unknown to be evil and attack Harry Potter, and in the latter they missed their head, and some green smoke was floating out.

Peeves once hidden inside some during the Christmas during the Triwizard Tournament, when the armours are singing Christmas carols with gaps in between their lyrics, which Peeves filled in with his own very rude inventions; Argus Filch had to extract Peeves on these occasions.

They all participated in the Battle of Hogwarts after being animated via Piertotum Locomotor by Professor Minerva McGonagall. Their fate is unknown if they ever survive the Battle of Hogwarts or were all destroyed in battle.

Behind the scenes

 * Some of the suits appear to have names such as the Axe Knight, Knight, Dark Knight, and Big Knight. The armour also seem to have a degree of sentience, as a suits head turned to watch Harry go to Umbridge's office, and another suit laughed when Neville tripped on the stairs. Also in the PS1 version of the second video game, Dobby brought some suits to life with a spell, this spell seemed to tickle them to laughing.
 * The knights that appear in Harry Potter and the Deathly Hallows: Part 2 are not, indeed, suits of armour; they are stone statues and do not come in shapes and sizes such as gargoyles and different animals as in the book. However they have different head-shapes, and it is possible that 'some of them' are suits as in the book some statues also protected the castle.
 * In Harry Potter and the Deathly Hallows: Part 2, the shields of the suits of armour in the front row have the House crests and Hogwarts crests on them: The far left a Gryffindor crest, the second from the left a Hufflepuff crest, the middle knight the Hogwarts crest, the second from the right a Ravenclaw crest, and the far right a Slytherin Crest.

Appearances

 * Harry Potter and the Philosopher's Stone
 * Harry Potter and the Philosopher's Stone (video game)
 * Harry Potter and the Chamber of Secrets
 * Harry Potter and the Chamber of Secrets (video game)
 * Harry Potter and the Prisoner of Azkaban (video game)
 * Harry Potter and the Goblet of Fire
 * Harry Potter and the Order of the Phoenix
 * Harry Potter and the Order of the Phoenix (video game)
 * Harry Potter and the Half-Blood Prince (video game)
 * Harry Potter and the Deathly Hallows
 * Harry Potter and the Deathly Hallows: Part 2
 * Harry Potter and the Deathly Hallows: Part 2 (video game)
 * LEGO Harry Potter: Years 1-4
 * LEGO Harry Potter: Years 5-7
 * Harry Potter LEGO Sets