To open locks
Alohomora
Fawkes
Phoenix
Draco's father
Lucius Malfoy
Cho Chang
Ravenclaw
"I’m going to bed before either of you come up with another clever idea to get us killed or worse… expelled!"
Hermione Granger
The summoning charm
Accio
Buckbeak
Hippogriff
Harry's Defense Against the Dark Arts teacher during his first year at Hogwarts
Professor Quirrell
Colin Creevey
Gryffindor
"It isn't much...but it's home."
Ronald Weasley
To transform a boggart
Riddikulus
Grawp
Giant
Wormtail
Peter Pettigrew
Justin Finch-Fletchley
“Family…Whatever yeh say, blood’s important. . . .”
Hagrid
To erase memories
Obliviate
Aragog (and be specific!)
Acromantula
The werewolf who bit Remus Lupin
Fenrir Greyback
Katie Bell
Gryffindor
“Never trust anything that can think for itself if you can’t see where it keeps its brain.”
Arthur Weasley
The Perpetual Tickling Charm
Rictusempra
Arnold
Pygmy Puff
Escaped from Azkaban with the help of his mother
Barty Crouch, Jr.
Marcus Flint
Slytherin
“If you want to know what a man’s like, take a good look at how he treats his inferiors, not his equals.”
Sirius Black