Harry became so enamoured with the spell that he eventually used it to finish off Lord Voldemort. Here's how Harry's relationship with Expelliarmus became his signature – and why that's a good and bad thing.
1. Expecto Patronum. This is undoubtedly the most popular spell in the film series. This powerful defensive incantation uses a happy memory to conjure something positive, like a silvery-white animal that can chase off Dementors.
2 Remus Lupin: Riddikulus.
Other Favorite Spells
Plus, there were some votes for Obliviate (erases memory), Silencio (silences someone or something), Homonculus Charm (reveals someone's true identity and location), and Levioso (levitation, and some fans say that this is Ron Weasley's signature spell).
Wingardium Leviosa
This is the spell that nearly ended Hermione and Ron's relationship way before it began, when Hermione went full know-it-all: 'It's Wing-gar-dium Levi-o-sa, make the “gar” nice and long. '
Voldemort's signature spell was Avada Kedavra. Harry's was Expelliarmus.
The Disarming Charm became Harry Potter's signature spell, and it notably caused the death of Lord Voldemort during the Battle of Hogwarts by rebounding his Killing Curse because the Elder Wand recognised Harry as its master through the spell connection, and thus strengthened the Disarming Charm to the point that ...
As the youngest Weasley, we're sure Ginny observed more than her fair share of unpleasant spells over the years but it was the Bat Bogey Hex she was famous for – and with good reason.
Avada Kedavra
It's used to kill people, it's an Unforgivable Curse, and it was Voldemort's favourite, so it's going last.
Ginny was proficient at charms and curses, capable of holding her own against Death Eaters, including helping Hermione and Luna Lovegood to duel Bellatrix Lestrange. She was even able to cast a full-bodied Patronus, taking the form of a horse and is considered an extremely advanced spell.
It turns out (naturally) that Sirius was framed, and even after their twelve-year separation he and Lupin remain fiercely devoted to each other. By book 5, the two of them are living together in secret.
When James learned what Sirius did, he stopped Snape before he reached the Shrieking Shack, saving his life. Snape, however, had seen Lupin in werewolf form and was sworn to secrecy by Dumbledore.
He took a brutal werewolf attack in his stride like an absolute champ. When Bill was mauled by Fenrir Greyback, he was scarred for life.
Muffliato. This was the spell, the spell, Draco would use whenever Potter or Weasley tried to listen in on his and Hermione's conversations.
Malfoy spots Harry and casts a Cruciatus curse; Harry, defending himself, using the Half-Blood Prince's Sectumsempra spell without knowing its effects. To his horror, it gashes Draco's face and chest, spilling his blood everywhere. Moaning Myrtle flies off, screaming.
Aparecium is the revealing charm, used to reveal hidden messages or other markings which are hidden. It can also counteract a Concealment Charm.
Cruciatus Curse ('Crucio')
Harry tried to use this spell himself. The first time was against Bellatrix after she had killed Sirius. His attempt was unsuccessful because, as Bellatrix mockingly explained: 'You need to really want to cause pain – to enjoy it – righteous anger won't hurt me for long…'
Firestorm. Firestorm was a spell that created a large ring of fire around the caster's wand. This spell is one of the last and most powerful spells that Albus Dumbledore cast using the elder wand before his death.
Death Eater Bellatrix Lestrange was a well known practitioner of the Cruciatus Curse, where she would torture numerous victims to her immense satisfaction; thus this curse could be assumed to be her signature spell. It was often said by Dumbledore that she sadistically liked to play with her food before eating it.
Sectumsempra was a curse invented by Professor Severus Snape that lacerates the target and causes severe haemorrhaging. Snape created it as a student of Hogwarts, with the intention of using it against his enemies, likely including the Marauders, and it became one of his specialities.
Riddikulus is a spell used against boggarts. The caster must think of something funny while casting this spell. If successful, it forces the boggart to take the shape of whatever the caster was thinking about.
Expec - expecto patronum,' said Hermione. Nothing happened. 'It's the only spell she ever has trouble with,' Harry told a bemused Mrs Cattermole.
Her sacrifice gave Harry the power of love, a protection spell sealed with the blood spilled by her death.
In Harry Potter And The Deathly Hallows Part 2, Voldemort kills Snape using his snake Nagini instead of his favorite spell Avada Kedavra - here's why. Voldemort killed Snape in Harry Potter And The Deathly Hallows Part 2 using his Horcrux snake Nagini instead of his favorite Unforgivable Curse, Avada Kedavra.
The darkest of the Dark Arts, Harry Potter unforgivable curses are the Cruciatus Curse, the Imperius Curse, and the Killing Curse. Although the curses are highly illegal, Harry using Unforgivable Curses happened, but he uses them once he was thrust into the Second Wizarding War.