In many Naruto fanfictions, if Naruto has three bijuu, they could be the Nine - Tails (Kurama) which he already has in the original series, perhaps the Eight - Tails (Gyuki) as it has a connection with Naruto's world and Akatsuki's hunt for the bijuu. And another could be the Three - Tails (Isobu). However, it really depends on the specific plot and creative direction of the fanfiction.
In fanfiction, if Naruto is half - bijuu, it could mean he has enhanced physical abilities. For example, he might have greater strength and speed like a full - bijuu. His chakra reserves could also be much larger, allowing him to perform more powerful jutsu for longer periods.
It could be Shukaku. Since Shukaku was one of the first bijuu introduced in the series and has a sand - based power, it would be an interesting addition to Naruto's arsenal. Naruto's positive and energetic personality could also have an impact on Shukaku's usually grumpy and solitary nature.
Well, having two bijuu would likely make Naruto extremely powerful. He could potentially combine their unique chakra natures and abilities in combat. For example, if one bijuu has a fire - based ability and the other has a water - based one, he might be able to create new and unexpected jutsu by mixing them. Also, it would change his standing in the ninja world. People would probably be more in awe or more fearful of him, depending on their stance towards Naruto.
Naruto could face several challenges. Firstly, the mental strain of controlling such powerful entities. The bijuu have their own consciousness and desires, and keeping them in check mentally can be exhausting. Secondly, there's the issue of mastering different forms and abilities of the bijuu. Each bijuu has unique powers, and learning to utilize them effectively without losing control is no easy feat. Moreover, he may face social challenges as some in the ninja world may not trust him with this much power and try to undermine his control.
His power becomes extremely overwhelming. With all nine bijuu, Naruto gains access to an insane amount of chakra. He can perform massive jutsu without much strain. For example, his Rasengan could potentially be magnified to a scale that could destroy large areas with ease. Also, his physical abilities like strength and speed would be enhanced to superhuman levels due to the boost from the bijuu's power.
One possible plotline could be Naruto struggling to come to terms with his half - bijuu nature while also dealing with his relationship with the fem bijuu. Maybe there are other characters who are either afraid or in awe of his unique state, leading to various conflicts.
In fanfiction, if Naruto is half - bijuu, his appearance could change in several ways. His ears might be a bit pointed, like those of a fox if it was related to the Nine - Tails. There could be a faint glow around him, especially when he gets angry or uses his bijuu - related powers. His nails could be longer and stronger, like claws. And his gait or the way he moves might change, becoming more like the way the bijuu moves. He might even have a faint, beast - like growl in his voice at times, which would be a very distinct change in his appearance and the way he presents himself.
If Naruto has all bijuu in fanfiction, it's a huge game - changer. Firstly, his training and growth would be on a whole new level. He'd have to learn to balance the different natures and personalities of each bijuu. His opponents would have to come up with new strategies to face him. Moreover, it could open up stories about how he uses the bijuu to bring peace to the ninja world. Maybe he could use their power to stop wars and conflicts, or to protect the weak. It could also lead to interesting interactions with characters like Sasuke, as they might have different views on how to use such great power.
One common theme is the struggle for acceptance. Since male jinchuriki often face discrimination due to the power of the bijuu within them. Another theme is power control. They have to learn to control the powerful bijuu force. For example, in many fanfictions, the male character spends a lot of time training to master the bijuu's chakra.