His character might become more independent. Since he has to adapt to a different wand, he can't rely on what he already knows about using his old wand. He would need to be more experimental with his magic. This could make him bolder in trying new spells and techniques.
Harry could develop a sense of self - doubt. A new wand means new rules and he might not be as good with it right away. He may question his own magical abilities, but at the same time, this could also make him more determined to master the wand. As he struggles and overcomes the difficulties, he would grow into a more resilient wizard. Also, his relationship with his wand - maker, Ollivander, might become more complex as they try to figure out the secrets of the new wand together.
The story could develop with Harry facing new challenges related to the second wand. He might need to discover the secrets of the second wand, like what kind of wood it is made of and what core it has. This discovery process could be full of mysteries and danger.
His story might change drastically. With a different wand, his magic could be more powerful or less controllable.
Well, he could end up with a wand that has a much darker origin. This could lead to other wizards being suspicious of him. His relationships with his friends might change too. Hermione might be more cautious around him, and Ron could be a bit more distant. Also, his dueling abilities would be completely different. He might struggle at first to adapt to the new wand's unique way of channeling magic, which could put him at a disadvantage in battles against Voldemort and his Death Eaters.
The relationships in the story would also be different. His relationship with Ollivander, the wand - maker, would be very different. Instead of the familiar bond over his original wand, there would be a new dynamic as Ollivander tries to figure out the new wand's secrets. His relationships with his teachers could also change. Some teachers might be more interested in his new wand and its potential, while others might be more wary. This would lead to different interactions and plot developments throughout the fanfic.
The different wand might change his abilities in terms of spell specialization. Say the new wand has a different wood that is attuned to certain types of magic. If it's a wand made of willow, which is often associated with healing magic, he could find himself more proficient in healing spells, even if he wasn't before. This would be a significant shift in his magical abilities as he would be able to contribute in a different area of magic within the wizarding world.
His confidence would likely skyrocket. With the new powers from the Ultimatrix, he'd be able to take on challenges more boldly. He might become more independent as he explores the abilities on his own.
It could develop the story by showing Harry's growth in handling power. With the Elder Wand, he has a great responsibility. The fanfiction might explore how he copes with the temptation to use it for personal gain, which was a theme in the original series. For instance, he could resist the urge to use it to make himself the most powerful wizard instantly.
In such a fanfiction, Harry would grow in his understanding of the dark side of magic. Being captured by Voldemort means being exposed to the darkest and most malevolent forms of magic. This would make him more cautious in his own use of magic, but also more knowledgeable about how to counter dark magic. His character would also become more patient. He can't rush into things as he is in a very dangerous situation. He has to bide his time, wait for the right moment to escape or fight back. This new - found patience would be a valuable asset in his future battles against Voldemort. Moreover, he would develop a stronger sense of self - identity. He would be constantly reminded of who he is and what he stands for in the face of Voldemort's attempts to break 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.
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.