Order of the Phoenix/Dumbledore's Army/Other Allies:
* Mundungus Fletcher: A shady, unreliable member of the Order of the Phoenix who steals from Harry's house.
* Neville Longbottom: While he plays a larger role in the overall series, Neville becomes a key figure in the resistance during Deathly Hallows, demonstrating incredible courage and strength.
* Luna Lovegood: Another member of Dumbledore's Army, Luna's eccentricity and unwavering belief in Harry provide comfort and a different perspective.
* Dean Thomas: A friend of Harry's, Dean is a member of Dumbledore's Army and later joins the Order of the Phoenix.
* Seamus Finnigan: Another member of Dumbledore's Army, Seamus remains loyal to Harry and the cause.
* Lee Jordan: Harry's friend from Gryffindor, Lee is a member of the Order of the Phoenix and helps in various ways throughout the story.
* Aberforth Dumbledore: Albus's younger brother, Aberforth reveals a surprising connection to the story, revealing a critical element of Dumbledore's past and providing Harry with vital information.
* Nymphadora Tonks: A member of the Order of the Phoenix, Tonks has a love for Remus Lupin and faces a tragic fate during the war.
* Remus Lupin: Harry's former Defense Against the Dark Arts teacher, Lupin is a werewolf and member of the Order of the Phoenix. He falls in love with Tonks and has a son with her.
* Kingsley Shacklebolt: A powerful Auror and loyal member of the Order of the Phoenix, Kingsley plays a crucial role in the final battle.
Ministry of Magic/Other Officials:
* Rufus Scrimgeour: The Minister for Magic who briefly replaces Cornelius Fudge, Scrimgeour is initially skeptical of Harry's claims about Voldemort's return.
* Amelia Bones: A powerful Auror and Head of the Department of Magical Law Enforcement, Amelia is tragically killed by Voldemort's Death Eaters.
* Dolores Umbridge: The former Minister for Magic and a key antagonist in Order of the Phoenix, Umbridge continues to be a thorn in the side of Harry and his allies in Deathly Hallows.
* Barty Crouch Jr.: A Death Eater posing as Mad-Eye Moody in Goblet of Fire, Crouch Jr. is a powerful villain who plays a key role in the events of the previous book and continues to be influential in Deathly Hallows.
Other Characters:
* Kreacher: The house-elf who serves the Black family, Kreacher's loyalty is complex and initially conflicted. However, he eventually becomes a valuable asset to Harry.
* Dobby: The house-elf who saves Harry's life multiple times, Dobby is a loyal friend and plays a pivotal role in the story's conclusion.
* Griphook: A goblin banker at Gringotts Wizarding Bank, Griphook becomes important in Harry's quest for the Hallows.
* Rubeus Hagrid: Harry's friend and half-giant, Hagrid plays a significant role in helping Harry throughout the story. He remains a source of comfort and support.
* Winky: The house-elf who serves the Crouch family, Winky is a tragic figure who struggles with her freedom and loyalty.
It is important to note that this is not an exhaustive list, and the definition of a "minor" character can be subjective. Many other characters, including some with only brief appearances, contribute to the richness and complexity of the story.