No, he is the main character in the series. The only book he could have died in was the last one.
No, Hedwig died in the final book, Harry Potter and the Deathly Hallows.
Page 638 of Harry Potter and the Goblet of Fire.
No, none of the dragons died during the task. They were taken back to Romania after the task was completed.
Yes. But then he comes back to life because Voldemort took his blood in The Goblet of Fire. So Lilly Potter's sacrifice still lives, only within Voldemort. In order to kill Harry, he would have to kill him self too.
Cedric Diggory was murdered using the Killing Curse (Avada Kedavra) by Peter Pettigrew on Lord Voldemort's order. Voldemort wanted to get to Harry and clearly, Diggory was in his way which is why Voldemort did away with him. Also, Lord Voldemort did not want anyone living to warn everyone that he had returned. Considering he planned on killing Potter, Voldemort did not think even he would live to warn anyone.
He got Dementor-kissed; we don't know what happened with his soul-less body. Being given the kiss is described as a fate worse than death.
No. Norbert, who turned out to be a girl and was renamed Norberta, was raised with other dragons in Romania. Rubeus Hagrid asks Charlie Weasley about her in Harry Potter and the Goblet of Fire.
Harry Potter kills Lord Voldermort/ Tom Marvolo Riddle.Both except Harry comes back to life. Its a bit confusing, Harry was a horcropse(?) like the goblet the snake and the necklace so Harry had to die to kill Voldemort.
There is no Niki in Harry Potter.
There is no such character in Harry Potter.
Yes Voldemort does die, Harry Potter defeats him
Harry Potter doesn't die and if you want to know for yourself, then read the Harry Potter series, espeially number 7.