He could get a wand with a phoenix feather core from a very special phoenix. This would make his wand extremely powerful and have a strong connection to the element of fire, symbolizing his courage.
Well, perhaps they'll meet a really eccentric wandmaker. This wandmaker might have all sorts of unique wand - making techniques. Maybe they'll use rare magical woods or cores that are not commonly used. Harry could be in for a real adventure in this fanfic. He might discover a whole new side to wand - making that he never knew before.
Maybe an old, reclusive wand - maker who has been waiting for the right wizard to come along. This person could have a special intuition about wands and see something unique in Harry.
Well, it could be described in various ways. Maybe it has unique carvings on it, like ancient runes or symbols related to Harry's personal journey. It might be made of a special wood that's not common in the regular wand lore, like a wood from a magical tree only found in a hidden forest.
It could be an old and reclusive wandmaker who has a special connection with Harry. Maybe this wandmaker sees potential in Harry that others don't and decides to create a custom wand for him.
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.
One idea could be a wand made from a phoenix feather core and ebony wood. In fanfic, it could be a wand passed down through generations and have special powers like being able to communicate with phoenixes. Another idea is a wand with a mermaid scale core and coral - like wood. It might be able to control water elements and be used by a wizard who has a special connection to the sea.
The custom wand in the fanfic could lead to a whole new set of adventures for Harry. It could be made from a rare material that attracts the attention of dark wizards who want to steal it. This would put Harry in a dangerous situation where he has to protect his wand and himself. The wand might also have a mind of its own and guide Harry to places he never thought of going, like hidden chambers in Hogwarts or ancient magical sites outside of the school.
It's also likely that they go to Romania. Given Sirius' knowledge of the wizarding world, he might know of a safe haven there. In Romania, they could be around dragons and learn about dragon - related magic. Harry would surely be fascinated by the dragons and it could be a place where he can grow stronger in a different kind of magical environment.
Their relationship would be severely damaged. Harry would likely feel betrayed by Sirius. After all, Sirius is supposed to be one of his protectors. It would be a huge breach of trust. Sirius, on the other hand, would probably be filled with guilt if he realizes his mistake. He would have to work hard to regain Harry's trust, if that's even possible in the context of the fanfic.
Well, if Sirius takes Harry to Voldemort in a fanfic, it would be a huge deviation from the normal story. One possibility is that Sirius is trying to make some sort of deal with Voldemort to save others. But Voldemort is not one to be trusted. Harry, being the Boy Who Lived, is a valuable asset to Voldemort for his own dark purposes. It could lead to a tense stand - off where Harry has to use his own wits and magic, even at such a young age, to try and escape the clutches of the Dark Lord.