A character from the 'lessons in love' universe could be the main character as well. For instance, a character who is an expert in love but knows nothing about the ninja world. This character could meet Naruto and be intrigued by his way of life. As they interact, they both learn from each other. Naruto learns about different forms of love from this character, and the character learns about courage, loyalty and friendship from Naruto.
The plot might involve Naruto falling in love with a character from a different story within the fanfiction. He could teach that character about his ninja way of life, and in turn, learn about love from them. Their relationship could develop as they face challenges together, like fighting off enemies that are against their relationship or dealing with cultural differences between Naruto's world and the new world.
Definitely Naruto would be a main character. He is the protagonist of the original series and would be the one to drive the story forward in the crossover. Then, perhaps a new character could be introduced who has a special connection to the bone - related aspect. This character could be from another world or a long - lost clan in the Naruto universe. Also, Gaara could be a main character. His sand powers could interact in interesting ways with the bone - related elements, like his sand protecting him from bone attacks or being able to incorporate bones into his sand defenses.
Obviously, Naruto would be one of the main characters. He's the protagonist of the Naruto series and would be the main link to the ninja world in this crossover. Another could be a young Kitsune, maybe one that's just coming of age in the Kitsune world. Their paths cross, and they have to learn to work together.
Obviously Naruto himself would be a main character. He could be joined by Sasuke. In a crossover with 'One Piece', Luffy could also be a main character in the fanfiction, as he is the captain in 'One Piece' and would bring his own unique charm and abilities.
One possible main character could be Boruto's son or daughter. They would inherit Boruto's strong ninja skills and have their own unique personalities. Another could be Sarada's descendant, who might have a combination of the Sharingan and some new, unexpected power. And of course, there could be a descendant of Mitsuki, with his unique snake - like abilities and calm demeanor.
Obviously Naruto could be one of the main characters. And for the archer, it could be a new character, perhaps someone from a far - off land who has a natural talent for archery and a mysterious past.
Obviously Naruto would be one of the main characters. He could be the one to bridge the gap between the ninjas and the Transformers. Optimus Prime would also be a main character. His leadership and sense of justice would be important in any plot. Maybe Sasuke could also play a major role. He might be initially hesitant about working with the Transformers but eventually see the benefits. And Bumblebee could be another key character, as he is very friendly and could easily bond with the young ninjas.
Sasuke could also be a main character in this fanfiction. His brooding and powerful nature would add a different dynamic to the story. He might have a more conflicted relationship with the Fleet of Fog compared to Naruto. And perhaps a female character from the Fleet of Fog, like a skilled navigator or strategist. She could provide a fresh view and have some interesting interactions with the Naruto characters, whether it's in terms of friendship or rivalry.
Naruto is a must - have as the main character. For the Pokemon world, maybe Eevee could be a key character. As for the harem, there could be new female characters created specifically for this fanfiction. They could be a mix of half - Pokemon, half - human hybrids. Also, Hinata could be part of the harem. In the Pokemon world, her shy but strong - willed nature would be an interesting addition, and she would support Naruto in his adventures.
Obviously Naruto could be one of the main characters as the story is based on the Naruto universe. For the omega character, it could be someone new created specifically for this crossover. Maybe an omega with the ability to control nature in a different way than Naruto's chakra control.