Well, definitely Sakura. She has always been an important part of Naruto's life. Hinata is also a very possible choice because of her love for Naruto. In addition, if it's a crossover, there might be characters like Mikasa from Attack on Titan. She is a fierce fighter and might be drawn to Naruto's courage against the Juubi. There could also be characters from Naruto's own world like Ino, who has her own connection to Naruto and could be part of this mass harem.
In this 'naruto the juubi crossover mass harem fanfiction', the plot might revolve around Naruto being thrust into a situation where the Juubi's energy somehow creates a harem around him. It could start with Naruto's battle against the Juubi. After some kind of encounter with the Juubi's power, female characters from various places start to flock to him. They could be attracted by his new - found power related to the Juubi or some other mysterious connection. Naruto would then be in a position where he has to balance his ninja duties, understanding the Juubi, and dealing with his new - found relationships.
Definitely Hinata. Since she has feelings for Naruto in the original series, she could be a part of the harem. Sakura might also be there as she is an important female character. From the Juubi - related side, maybe a female form of one of the tailed beasts. Also, Tenten could be included as she is a strong female ninja. And perhaps a mysterious female character who has a special connection to the Juubi's power.
Obviously Naruto would be the main character. As for the harem, characters like Hinata could be part of it. She has always had feelings for Naruto. Sakura might also be involved as she has been an important part of Naruto's life. And perhaps some new female characters could be introduced, like a powerful kunoichi from a far - off land who senses Naruto's new power from the Juubi and is drawn to him.
Sakura could be one of the main female characters. She's strong - willed and intelligent. Her medical knowledge and combat skills would make for interesting interactions with Ichigo. Hinata is another possibility. Her shy nature and her Byakugan abilities could lead to some unique moments with Ichigo. And then there's Ino. With her mind - control jutsu, she could have some really fun and complex relationships with Ichigo in the crossover.
From Naruto, Tenten could be in the harem. She is a skilled weapon user. In the DBZ universe, Marron could be part of it. She is Krillin's daughter and could have her own story arc in this harem situation. Also, Pan from DBZ, being Goku's granddaughter, could be an interesting character in the harem with her Saiyan blood and adventurous spirit.
It could be a powerful ninja from Naruto's world who has been corrupted by the Juubi's power and somehow ended up in the Inuyasha world. He wants to use the power of the demons in the Inuyasha world to make himself even stronger and take over both worlds.
Liara T'Soni would be a great candidate. She is intelligent and curious, and Naruto's different abilities and his unique personality would likely draw her in. She would be interested in studying his chakra and his ninja techniques.
Obviously Naruto would be one of the main characters. Since it's related to the Juubi, Sasuke could also play a major role. They've always been connected to the main threats in the Naruto universe. And if it's a crossover, maybe some characters from other popular anime could be involved, like Goku from Dragon Ball. He's super powerful and his presence could add an interesting dynamic to the story.
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.
For a 'naruto total drama crossover harem fanfiction', on the Naruto side, Tenten could be one of the main female characters. She's a skilled ninja and her tomboyish nature could bring a different flavor to the harem. From Total Drama, Bridgette could be included. She's kind - hearted and laid - back, which would be a great contrast to some of the more intense characters. And Zoey from Total Drama could also be in the harem. She's brave and has a good heart, and her relationship with Naruto could develop in some really interesting ways as they face the challenges of the combined worlds.