What would you do if you found out that there was someone much more powerful than you? Would you kill him or just leave him alone? The Dark Lord chose the bad choice. Tom Marvolo Riddle was discovered in an orphanage by Albus Dumbledore. Tom was a special kid. He is the last descendant of wizard Salazar Slytherin, one of the four founders of Hogwarts. Rowling described Voldemort as "the most evil wizard for hundreds and hundreds of years". His main goal in life is to kill Harry Potter. When he first tried to do this when Harry was very young, the Avada Kedvra curse didn't work. Instead it transferred some of Voldemort's powers over into Harry. When he did this, the curse left Harry with a scar in the shape of a lightning bolt and he is known as "The Boy Who Lived". Tom Marvolo Riddle didn't like his name due to the fact that one of his parents was a muggle. So he decided to change his name to Lord Voldemort. In the Chamber of Secrets he reveals by saying " I Am Lord Voldemort" which contains all of the letters used in Tom Marvolo Riddle. Eventually he is killed by Harry and that brings the end to his reign.
Luna Lovegood is part of the Raven Claw house and is quite weird. She likes to sleep with her shoes on because she sleep walks throughout the castle at night. She can also see Thestrals because she has seen death. Her father is the writer of the quibbler. Her mother died when she was 9 because she was experimenting with some spells and they just went wrong. Luna is socially isolated at school, but she appears to care little for what others think. In the Order of the Phoniex she and her father are the little few that seem to think that Harry is innocent. Harry later invites Luna to Slughorn's Christmas party. She also does the Quidditch commentary for Gryffindor's game against Hufflepuff, a scene that Rowling particularly enjoyed writing, calling it "blinding inspiration" After Harry and Ginny get married, they name their daughter "Lily Luna", after Luna. She was crazy, yet brilliant in their time of need. She came through for them in ways no one could.
In every place there is a shy kid that everyone thinks will amount to nothing but this kid proved them all wrong. Neville Longbottom lives with his grandmother and attends Hogwarts. He is in Gryffindor and has helped earn the house points. Neville is also highly gifted in Herbology. He is often teased a lot by Malfoy and his crew. His parents, Frank and Alice Longbottom, were prominent Aurors and Order of the Phoenix members until they were tortured and permanently incapacitated by a group of Death Eaters led by Bellatrix Lestrange; Neville was subsequently raised by his paternal grandmother, Augusta. Neville plays a minor role in the first four books, but Rowling wanted him to perform an act of bravery in Philosopher's Stone, in which Neville "finds true moral courage in standing up to his closest friends — the people who are on his side" towards the climax. He easily could have become the chosen one instead of Harry but Voldemort attacked Harry instead. He also takes the role of rebuilding Dumbledore's Army during his last year while Harry is off trying to defeat Voldemort. Neville also destroys Nagini during the Battle of Hogwarts, thus destroying the final Horcrux. In the epilogue, he returns as a Herbology teacher at Hogwarts due to his love for the subject. He also marries Hannah Abbott, who then became the new landlady of the Leaky Cauldron. They live right above it and he is considered to be a true friend and hero to all at Hogwarts. 
Everybody loves a boy with an accent, and boy does this kid have one. Seamus has been a friend to Harry and his crew throughout the years. They met when they first came to Hogwarts. He was placed in Gryffindor his first year. He is a huge Quidditch fan and supports the Kenmare Kestrels, and is best friends with housemate Dean Thomas.His mother is a witch and his father a Muggle, who only found out his wife's secret after their marriage; according to Seamus, it was "a bit of a nasty shock for him when he found out." He is of Irish decent and is easily influenced by his parents. In the Order of the Phoenix, he almost didn't return and he got into a heated argument with Harry about what the Daily Prophet's saying about him but then comes to apologize. 
Long awaiting for his job as Defense Against The Dark Arts teacher, Severus Snape is a very confusing character. You may think he is good yet you may also think he is bad you won't know until you see the last Harry Potter movie. He is portrayed as a cold hearted, big jerk teacher that everyone hates but is that really what he is? When he attended Hogwarts he was in love with Lily Evans which is Harry's mothers but ridiculed by James Potter, Harry's dad. Dumbledore trusts him with his life yet he is also a Death Eater who are Voldemort's followers. What exactly is this man we call Snape. He eventually gets out of his Potions job and gets transfered to teach Defense Against The Dark Arts, the job he has been after for years and then at the end of the series Headmaster of Hogwarts. Yet he is killed in the battle of Hogwarts just before he dies he tells Harry that is only mission has been to protect him because he vowed it for Lily. His love for Lily extended to the protection of her orphan son Harry. So it turns out that Snape is the greatest double-agent ever! I hope this changes your opinion of Severus Snape and that you see he is really the best good guy in the book and not a Death Eater who is after to kill Harry because if he was he would have done it by now.
