Ginny Weasley

The only daughter of Molly Weasley, Ginny sports a toughened persona to keep company with her bros. Skilled at Quidditch, she played as Chaser and Seeker for the Gryffindor House team. She developed a huge crush on Harry, and the two of them survived quite an ordeal when she became possessed with Tom Riddle's diary, opened the Chamber of Secrets and put in grave danger herself, Muggle-borns at Hogwarts, and Harry.

Fleur Delacour

Half Veela and half witch, Fleur possesses extraordinary beauty and the ability to entrance men supernaturally. Fleur first appears in Goblet of Fire when her French academy participates in the Triwizard Tournament. She later meets Bill Weasley while working at Gringotts Wizarding Bank, and the two fall in love and become engaged. Their wedding ceremony is not without an unwelcome interruption, however, due to the perilous times of Voldemort's return.

Draco Malfoy

Harry's rival at Hogwarts takes after his father's pure-blood instincts, demonstrating prejudice to Muggle-borns as well as bullying other students. He's recruited to join the Death Eaters' effort and charged with the daunting task of killing Dumbledore when his father falls out of favor with Voldemort. A few of his failed attempts injured other students and, when he is unable to complete the task, Snape carries out the deed. Draco was instrumental in finding a way for the Death Eaters to enter Hogwarts.

Bellatrix Lestrange

As Voldemort's most devoted Death Eater, Bellatrix Lestrange's magical prowess is employed with her own sadistic and mentally unstable flair; she tortured Neville Longbottom's parents to the point of insanity to gain information about Voldemort's whereabouts, and killed her own cousin, Sirius Black. Sentenced for life, she spent 14 years in wizarding prison Azkaban before she escaped and rejoined Voldemort in his return to power. Since then, she's been his number one in command, executing his bidding.
 
Fun Fact: Although Bellatrix is married to another Death Eater, Rowling has made it known that she truly loved Voldemort.

Albus Dumbledore

The beloved headmaster of Hogwarts is known for his many magical contributions, endearment of students and fearlessness when facing Voldemort. Deathly Hallows explores Dumbledore's past and a side of him only a privileged few had come to know. Despite his untimely death, the white-haired wizard continued to be a mentor and friend to Harry through the things he left behind in his last testament and will. At the close, he pays Harry a special visit.

Luna Lovegood

Aptly named, and known for being a little more eccentric than most, Luna possesses a slightly off-kilter, yet composed persona. The Ravenclaw student is among the first to believe Harry when he claims that Voldemort has returned; she joins Dumbledore's Army, sparking the beginning of a strong friendship with the protagonist trio. Like a Patronus that appears in dire situations, Luna's presence never fails to procure hope and solace for Harry even in the darkest hours.

25 points for the FIRST person to tell me what is Luna's patronus.

Aberforth Dumbledore

 

The estranged younger brother of Albus Dumbledore owns the Hog's Head pub in Hogsmeade. The two were opposites and hardly got along, and after the unfortunate death of their sister, their relationship became all the more strained. After Dumbledore's death, Aberforth provides much-needed aid to Harry, Ron and Hermione in the war against Voldemort.