Obviously, Harry Potter is a main character as the title suggests. He is the one who is on the journey of learning wandless magic. Hermione Granger could also be an important character. She might be helping Harry research about wandless magic, using her vast knowledge from the library.
One interesting story could be Harry's initial struggles. He might face challenges like accidentally causing chaos as he tries to control his wandless magic. For example, he could make objects fly uncontrollably in the Gryffindor common room. Another aspect could be his secret training sessions. He might find a hidden place in Hogwarts, like an abandoned classroom, to practice without others knowing.
Overcoming limitations is also a theme. Since wandless magic is not the norm in the wizarding world as presented in the original books, Harry has to break through the traditional thinking. He has to deal with the doubts of others and his own insecurities. In some fanfics, he even has to face opposition from the Ministry of Magic who are wary of this unregulated form of magic.
There's also 'Wandless Ways of Harry Potter'. This fanfic delves deep into the concept of wandless magic. It has Harry learning from an ancient wizard who has mastered the art. The story is full of interesting spells and magical theories that are unique to wandless magic, making it really engaging.
One main theme is self - discovery. Harry realizing his ability for wandless magic is like finding a new part of himself. Another theme is breaking boundaries. Since wandless magic is not as common in the wizarding world shown in the original books, it represents going beyond the normal magical practices. And of course, there's the theme of growth, as Harry has to learn and develop this new skill, which often comes with challenges and setbacks.
In some fanfictions, Harry Potter might develop his wandless magic skills through intense mental training. He could practice focusing his magic without the aid of a wand, much like how he learned to control his Patronus. By visualizing the desired outcome clearly in his mind and concentrating his magical energy, he gradually becomes proficient at wandless magic.
One popular 'harry learns wandless magic fanfic' is 'The Wandless Wizard'. It has an interesting plot where Harry discovers his latent ability for wandless magic through a series of challenging adventures. Another one could be 'Wandless Magic: Harry's New Path', which focuses on how Harry's journey in learning wandless magic changes his relationships with his friends and teachers at Hogwarts.
One of the most impressive feats could be large - scale teleportation. In some fanfictions, Harry Potter manages to transport himself and others over long distances without a wand, which is extremely difficult magic even with a wand. Another could be instantaneously conjuring complex magical shields to protect against powerful dark spells, all wandlessly.
In some fanfictions, Harry Potter uses his strong emotions and willpower to perform wandless magic. For example, in times of extreme danger or when he has a very intense desire to protect someone, he can tap into his inner magic without the need for a wand.
Often, he uses his deep understanding of magic theory. Since he's learned a great deal about magic at Hogwarts, he can apply that knowledge in a wandless way. He might use incantations silently and with just a wave of his hand or a focused thought, as seen in fanfictions like 'The Wandless Path of Harry'. Here, he spends a lot of time researching and practicing wandless techniques based on the spells he already knows.