Harry Potter is a half-blood, since his maternal grandparents were Muggles.
Answer: Order of Merlin
The Order of Merlin was originally founded to defend Muggles.
Rubeus Hagrid was a professor of Care of Magical Creatures.
Answer: Ron Weasley and Hermione Granger
Harry's best friends are Ron Weasley and Hermione Granger.
Answer: Serpent of Slytherin
Harry mortally wounded the Serpent of Slytherin in the Chamber of Secrets.
Answer: Astoria Greengrass
Astoria Malfoy's maternal name is Astoria Greengrass.
Answer: Neville Longbottom
According to the prophecy either Harry's or Neville Longbottom had the power to vanquish Lord Voldemort.
Answer: All of the founders of Hogwarts
According to legend all four founders of Hogwarts enchanted the Sorting Hat, though it originally belonged to Godric Gryffindor.
Answer: Petunia Dursley
Petunia Dursley is Harry Potter's aunt and was his guardian upon his mother's death.
Answer: Molly Weasley
Molly Weasley is not only Harry's mother-in-law but also an accomplished witch.