There could be a witch who is an outcast from her own magical community. She comes to the Naruto world seeking refuge or a new purpose. Her backstory of being an outcast and the unique powers she has developed because of it make her an intriguing character. Maybe she has powers that are a mix of dark and light magic, which makes her unpredictable and adds a lot of drama to the story.
A witch character with the power to create illusions that are even more powerful than those in the ninja world would be really fascinating. She could use these illusions to deceive Naruto's enemies or even to teach Naruto new ways of using illusions himself. Also, a witch who has a deep connection with nature and can use nature's magic in the middle of the ninja world's battles would be quite an interesting addition to the fanfiction.
Obviously, Naruto is one of the main characters. Since it's about him being the son of a witch, his character development and exploration of this new identity are central to the story.
Mildred Hubble is definitely one of the most popular. She's the main character, so there are a lot of possibilities to explore her growth, her relationships with her friends and enemies, and her adventures at the witch academy. Ethel Hallow is also popular as she is Mildred's rival, and writers can play around with their relationship, either making it more amicable or more antagonistic. Maud Spellbody is another character that is often written about, as she is Mildred's best friend and a source of support for her in the difficult school environment.
The main witch character is often the most interesting. She usually has the most powerful magic and is at the center of the story. Her journey, from learning about her powers to using them to overcome challenges, is captivating.
The lead witch hunter, for sure. He has all the skills and determination to hunt witches, which makes him a very engaging character.
The outcast warlord is always an interesting character. Shunned by the other warlords, he has to rely on his own wits and the loyalty of a few followers. He could be hiding some amazing abilities or a great secret. Then there's the warlord who is a master of disguise. He can infiltrate enemy camps easily and gather crucial information. This makes him a key player in the power struggles. Also, the warlord with a split personality. One side of him is kind and just, while the other is ruthless and power - hungry. This internal conflict adds depth to the character and the story.
Some popular themes include power exploration. A witch in the Naruto universe might introduce new ways of using power that Naruto and his friends haven't seen before. There could also be a theme of mystery. The witch's origin and her true intentions can be a big part of the story. In some fanfictions, the witch may be from a far - off land and has come to the ninja world for a specific purpose, and Naruto gets caught up in that mystery.
For the Naruto characters in this crossover, you can start by emphasizing how they react to the witchcraft. For example, Naruto might be initially in awe but quickly see the practical applications of magic in his fights. His determination could lead him to try and learn some basic spells. As for the witches, give them distinct personalities. One could be a haughty witch who looks down on the 'primitive' ninja ways.
Diana is frequently a popular choice in fanfiction. Her cool and composed demeanor, along with her powerful magic skills, make her an interesting character to write about. She can be the center of stories that explore her rivalry with Akko or her own personal growth and challenges. Another popular character could be Ursula, especially in stories that delve into her past and her connection to the school and the students.
Definitely Sam and Dean Winchester. They are the heart of the show. In fanfiction for 12x19, their reactions to the events in the episode can be explored in many different ways. Castiel is also very interesting. His angelic nature and his relationship with the Winchesters always offer a lot of material for writers. And Crowley, with his complex personality and his own motives, can be a great character to write about in the context of this episode.
Some fanfictions might introduce a foreign ninja who has a strange connection to spiders, similar to the Aburame. This character could be from a far - off land and have a completely different understanding and use of spider - based powers. Their interactions with the Aburame clan, especially Shino, could be full of tension, curiosity, and the exchange of new ideas about spiders. They could be a potential ally or a new enemy, and exploring their motives and backstory can be really engaging in the context of the Naruto Aburame Spider Fanfiction.