Yes, he is still alive.
There was no mention of Helga Hufflepuff in the movies. They did not even reference the horcrux cup as being hers. She was cut out entirely.
He suspects but he isn't sure. Harry knows that all the founders of Hogwarts had items. He knew that Salazar's locket was a Horcrux and because Tom Riddle/Voldemort thought of Hogwarts as home it made sense to make them into Horcruxes. However, the diadem was 'lost' so Harry wasn't sure even Voldemort had found it until after reading Voldemort's mind he found out where it was and that it was a Horcrux.
No Harry Potter is considered fantasy. Even though there are mythical creatures in the book it's still considered a fantasy. Although, in my opinion Harry Potter is 100% reality. Long live Harry Potter -Luna
THE FOLLOWING IS A SPOILER. IF YOU HAVE NOT READ THE BOOK, DO NOT READ (THE FOLLOWING)!Nigini is a horcrux, a part of voldemort's soul.
harry potter loves his friends and his parents even though they're dead he almost gave voldemort the stone in movie one because he might have made Harry's parents alive
Harry only dies for a short time because he himself is not dying but the horcrux inside of him is dying. that horcrux is one that even Voldemort himself was not aware that he created it
HARRY POTTER YOU DUMMY!!!!!
put a scar on his face ... not so sure if thats even possible though
No, owls cannot talk. Even in Harry Potter.
Technically, no. There were two Horcruxes that Harry Potter didn't find: the Gaunt ring and himself. He also only destroyed one Horcrux when he stabbed the diary in his second year (although at the time he had no idea what he'd done). Albus Dumbledore destroyed the Horcrux that was in the Gaunt family ring before Harry even knew what a Horcrux was. Dumbledore never told Harry that he was a Horcrux until after it has been destroyed, he only (through memories) said that Harry must die to destroy Voldemort. The locket, cup and diadem were all found with Harry's help who also guessed that Nagini was the last one - but they were destroyed by Ron, Hermione, Crabbe and Neville.
Harry. Draco wasn't even in the room
Sister. Marjorie 'Marge' Dursley. This isn't the first time Harry met her and he is forced to call her Aunt Marge even though she isn't technically his aunt.