At the end of Harry Potter and the Deathly Hallows on the 2nd May 1998 during the final battle.
Lord Voldemort cast the killing curse at Harry using the elder wand, which Harry was technically the master of. The wand cannot be used against it's owner and so, the wand flew out of Voldemort's hand and Harry cast expelliarmus resulting in the spell hitting a now defenceless Voldemort.
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Harry Potter defeats Voldemort in Deathly Hallows part 2! Harry Kills him and the part of Harry that is Voldemort died to. Hate to give you a spoiler alert. Make sure to watch it when you have free time
He's the main character, one of the protagonists of the book, and I don't know what you mean about 'role', but I guess it's to defeat Voldemort if that's what you mean.
James Potter disagreed with Lord Voldemort's view on the wizarding world and his attempts to take it over. To Lord Voldemort, James Potter was just in his way of killing Harry Potter.
No. Harry Potter was hit by the killing curse in Harry Potter and the Deathly Hallows however, it only kills the part of Lord Voldemort's soul that was in Harry.
The baldy (and baddy) is Voldemort.
Harry, Ron, and Hermione need to find the 6 (of what they know) Horcruxes and destroy them. they found and destroyed them all to defeat Voldemort.