Deathly Hallows
Sirius Black
Sorcerer's Stone or Goblet of Fire
"Alohomora", "Lumos", and "Expecto Patronum"
1) First generation; James/Lily (and Sirius/Lily + Snape/Lily, sort of)2) Second generation; Harry/Hermione, Harry/Luna, Ron/Hermione3) Third generation; Scorpius/Rose
Hogwarts, definitely!
Either Fawkes, Hedwig, or Buckbeak. It's so hard to choose just one! :D
Dobby!
Chapter 34 of Deathly Hallows when Harry walks into the forest to face Voldemort.
The Potters & the Weasleys :D
Transfiguration & Defense Against the Dark Arts
The scene in Sorcerer's Stone when Ron sacrifices himself in the big chess match.
The HP Lexicon and the Leaky Cauldron.
Gryffindor, of course! Although I like Ravenclaw a lot, too.
Bellatrix.
The Room of Requirement, the library, and the Gryffindor Common Room.
Professor McGonagall & Professor Lupin
Arthur Weasley (I'm not a huge fan of the Ministry or their employees, other than Arthur)
Department of Magical Law Enforcement and Department of Mysteries
Broom, of course!