A magical creature that has a special bond with the Wonder Wand. For example, a phoenix that was present when the wand was created. This phoenix could communicate with Harry in a way that no other character can and offer him insights and warnings about the wand's true nature.
An old witch who was once an apprentice to the maker of the Wonder Wand. She could hold many secrets about the wand's construction and powers. Her character could be a bit of a mystery, and she could either help or hinder Harry depending on her own motives.
Maybe it's an old wandmaker from a far - off land. This wandmaker has been crafting wands for centuries and has a unique intuition about which wands are meant for which wizards. He sees something special in Harry and presents him with a new wand.
A character who is a descendant of the original maker of the Elder Wand. They might have an innate connection to the wand and possess knowledge about its secrets that no one else does.
An old ex - Auror who now lives near Hogwarts. He could have a past connection to Voldemort and some knowledge about the Dark Arts used in the Triwizard Tournament. He becomes an unofficial mentor to Harry, teaching him some unique spells and strategies that are not part of the regular Hogwarts curriculum. This character could bring a new perspective and a bit of wisdom to the story.
He could collaborate with Ollivander. Ollivander is the expert in wands, and he has a vast knowledge of wand - making materials and techniques. Working together, they could combine their knowledge to create something truly extraordinary.
There's a chance that the maker is a new character, an old hermit wizard who lives deep in the Forbidden Forest. He has been observing Harry from afar and realizes that the wands available in the regular market are not sufficient for him. So, he uses his knowledge of forgotten magics to craft a custom wand just for Harry.
A young wizard from a nomadic wizarding tribe. This character could have skills in magic related to the elements in a very unique way. For instance, they can control the wind to fly without a broomstick, which would be amazing in the Triwizard Tournament tasks. They would also bring in a different cultural aspect to the story with their tribal traditions and beliefs.
A dragon - tamer from a nomadic magic tribe. This character could have grown up around dragons and have a deep understanding of their behavior. They could be a wild card in the tournament, not really following the traditional Hogwarts ways of dealing with dragons and bringing a fresh perspective.
In the 'Harry Potter gets a new wand fanfiction', Harry getting a new wand could lead to a whole new set of adventures. He might have to go through a series of trials to fully bond with the wand. The wand could also have a mind of its own, guiding Harry towards certain magical discoveries that were previously unknown. It could also attract unwanted attention from dark wizards who are jealous of its power.
The new wand might have a core that is a combination of multiple magical elements. For example, a strand of a unicorn's hair combined with a shard of a powerful magical crystal. This would make the wand extremely versatile, able to channel different types of magic depending on how the wizard holds it and the incantation used.
A character like a half - elf half - wizard who has a special connection to the Ravenclaw Diadem. Maybe they were born in the Forbidden Forest and their elven heritage gives them an intuition about magical artifacts. They sense the diadem's power and are drawn to Hogwarts to protect it from those who would use it for evil.