Yes lots of them.
Hedwig the owl, Collin Creevy, Fred weasley, Severus snape, Bellatrix lestrange, Voldemort, Tonks, Remus Lupin, Nagini the snake, Crabbe, and a few little characters that dont really matter that much
Well the actor that played Dumbledore in the first two movies, Richard Harris, died after the second movie came out, so he was replaced.
Nobody has died during the making no. However one cast member was killed (Robert Knox - Marcus Belby) and one died of Hodgkin's Disease (Richard Harris - Albus Dumbledore) in between filming.
Yes.
By making your fancy dress better than that of anybody else who participates.
Harry Potter went with fellow Gryffindor student Parvati Patil to the Yule Ball in 1994 (during the time of Harry Potter and the Goblet of Fire. However, Harry didn't want to go with Parvati; he wanted to go to the Yule Ball with his crush, Cho Chang, but she was going with Cedric Diggory.
Harry Potter and the Prisoner of Azkaban is the third book in the original Harry Potter series.
Yes, Lord Voldemort has red eyes in the book.
Not during the series.
He didn't kill anybody.
No.
Yes.
There isn't anybody in the Harry Potter books called Henry. Or "Herny".
By making your fancy dress better than that of anybody else who participates.
Harry Potter went with fellow Gryffindor student Parvati Patil to the Yule Ball in 1994 (during the time of Harry Potter and the Goblet of Fire. However, Harry didn't want to go with Parvati; he wanted to go to the Yule Ball with his crush, Cho Chang, but she was going with Cedric Diggory.
I am not aware of any Lydia in Harry Potter - nor of anybody with a similar name. The closest is perhaps Lily - Harry's mother.
Why? For the same reason that anybody else eats.
In the Harry Potter world, a "muggle" is anybody who is not a witch or wizard, in other words, a non-magic person.
In "Harry potter and the goblet of fire" peter pettigrew is making the dark potion.
You can by harry potter costumes by going to the making of harry potter in florida