One way is through enhanced emotional bonds. If Naruto experiences a very strong emotion like extreme love or a sense of justice, it might trigger a stronger connection to the Kyuubi and thus more power. Another way could be through new types of seals. Maybe a fanfic writer creates a seal that not only contains the Kyuubi but also channels its power more effectively to Naruto.
There are several ways Naruto can get power from the Kyuubi in fanfic. He could be in a situation where he has to merge his consciousness with the Kyuubi's on a deeper level. This could result in a power boost as they become more like one entity. Additionally, if there are other characters in the fanfic who have knowledge about the Kyuubi that Naruto doesn't, they could teach him new methods to draw power from it. For example, an ancient sage in the fanfic might know a secret technique to access the Kyuubi's most powerful form of chakra that Naruto can then learn and use.
One common way is by sharing its chakra. Naruto can draw on this extra chakra to increase his strength and speed. Another way is through its knowledge. Kyuubi has a long memory and can pass on useful information about the ninja world.
Well, often in Naruto fanfic, Naruto can get power from the Kyuubi when he manages to break through the mental barriers that were set in the original series. He might be able to communicate better with the Kyuubi and convince it to lend him more power. It could also be that some external force or event in the fanfic world allows him to access the Kyuubi's power in a new way, like a magical artifact or a new type of jutsu.
In some fanfics, when in Kyuubi form, Naruto can be more aggressive. The Kyuubi's influence might make him less hesitant in battle and more direct in his attacks.
Well, Kyuubi might be possessive of Naruto because they have a unique bond. Kyuubi has been inside Naruto for a long time. They've shared experiences, and Kyuubi may see Naruto as its own in a way. Also, Naruto has sort of tamed Kyuubi to an extent, and this might make Kyuubi feel like Naruto is special to it, so it shows possessiveness.
One way is through Naruto's appearance. The Kyuubi's power might make Naruto's hair look wilder, like the Kyuubi's fur. His face could also get some markings similar to the Kyuubi. Another way is his strength. When Naruto uses the Kyuubi's power, he might be so strong that it scares people and they start to see him as a demon. Also, the Kyuubi's negative emotions can influence Naruto, making him seem cold and cruel at times.
No. In the Naruto series, Naruto is the host of the Kyuubi, not its slave. Fanfics might deviate from the original concept, but in the official story, Naruto has a symbiotic relationship with the Kyuubi. He gains power from it and eventually befriends the Kyuubi spirit.
Naruto would likely be more confident earlier. Since the Kyuubi bloodline gives him great power, he might not face as much ridicule from the villagers. This would change his initial motivation from seeking recognition to something more like fully mastering his bloodline powers.
In certain fanfictions, Naruto's lightning power is used in a more strategic way. He might use it to create diversions. For example, he could make a bright flash of lightning in one area to distract his opponents while he moves to a different position for a surprise attack. He could also use it in combination with his shadow clone jutsu. The clones could be made to carry a small amount of lightning power each, and when they are attacked or dissipated, they release a shock that stuns the enemy.
One common way is through power boosts. The Kyuubi's chakra gives Naruto the strength to take on tougher opponents.
In some fanfictions, Kyuubi's protection is shown as a very direct physical act. For example, it might take over Naruto's body completely to fight off a powerful enemy. In others, it could be more of a mental or emotional support, like giving Naruto advice or calming him down during a difficult situation.