What notable cameos are there?

• Aberforth Dumbledore: Saves Harry Potter twice; opens the secret passage to Hogwarts.
• Neville's Grandmother: Overpowers the death eaters who come for her. Comes to fight in the battle of Hogwarts.
• Dobby: Rescues Harry, Ron, Hermione, Olivander, Luna and a Goblin from the Malfoy Mansion.
• Kreacher: Helps solve the mystery of the locket. Leads the house elves in the battle of Hogwarts.
• Percy: Makes amends with his family and fights in the battle of Hogwarts.
• Bathilda Bagshot: Possessed by Nagini; tries to kill Harry.
• Grindlewald:Tries to atone for his past by keeping secret the location of the Elder Wand from Voldemort.
• Olivander: Captured by Voldemort in an effort to try to learn how to destroy Harry Potter.
• Stan Turnpike: Now a Death Eater trying to kill Harry Potter.
• Victor Krum: Guest at Fleur's Wedding.
• Professor Trelawney: Drops crystal balls on the invaders in the battle of Hogwarts.
• Dolores Umbridge: Undersecretary to the minister of Magic. Interrogates muggle born wizards and punishes those who are not pureblood.
• Dudley Dursely: Goes into hidding with Petunia and Vernon, but not before thanking Harry for saving him from the dementors.
• Minerva Mc Gonagall: Organizes the rebellion in Hogwarts, ousts Severus Snape.
• Flitwick, Slughorn, Sprout: Help evacuate the students and oust Serverus Snape.
• Narcissa Malfoy: Betrays Voldemort and helps Harry Potter play dead to end the battle of Hogwarts and save Draco Malfoy.
• Crabbe and Goyle: enter Hogwarts through the room of requirement to find Harry Potter, but end up accidentally destroying the Diadum of Rowena Ravenclaw.
• Xenophilus Lovegood:explains the Deathly Hallows and betrays Harry Potter to the death eaters in exchange for Luna's freedom.
• Neville Longbottom: Leader of Dumbledore's army. Banished from Hogwarts to hiding in the room of requirement. Summons the order of the pheonix to the battle of Hogwarts. Kills Nagini with the sword of Goddoric Gryffindor.
• Gwap: Joins the battle of Hogwarts.
• Hagrid: Helps Harry escape from the Dursely's on Sirrius' motorcycle. Joins the battle of Hogwarts. Kidnapped by Voldemort and forced to carry the "dead" body of Harry Potter back to the castle.
  
• Hedwig dies in chapter 3.
• Hermione's parents: she erases their memory of her and makes them move to Australia to keep then safe.