The glowing eyes could also be used as a way to attract the attention of a mysterious character. Maybe there's a powerful and reclusive ninja who is intrigued by Naruto's glowing eyes. This character then becomes either a mentor or an antagonist to Naruto, depending on their motives. It adds an element of mystery and new relationships to the fanfiction.
One common plot device is that Naruto has to adapt to the new magical rules of the Negima world. Another is that he might be on a quest to find a way to transfer his immortality or use it to save the Negima world from a great threat.
One interpretation could be that the glowing eyes represent a new level of power. For example, Naruto might gain a special form where his eyes glow as a sign of enhanced chakra control or a new jutsu. Another view could be that the glowing eyes are a symbol of his inner emotions, like when he's extremely determined or angry. In some fanfictions, they might also be related to a special bloodline ability that was previously undiscovered.
One common plot device is the discovery of a new source of natural energy. In fanfictions, a character might stumble upon a hidden place filled with concentrated natural energy. This discovery then sets off a chain of events, like other characters trying to take over the place or the finder having to protect it.
A common plot device is using the Body Flicker for a surprise attack. The character seems to disappear and then suddenly reappears right next to the enemy. Another is using it to escape from dangerous situations quickly. For example, when a character is surrounded by foes, they use the Body Flicker to vanish into the forest.
Well, it could symbolize a new power awakening. Maybe he's tapped into some ancient or forbidden chakra source that gives his eyes this glow, like a sign of a special bloodline limit he didn't know he had.
They can create a sense of mystery. For instance, if Naruto suddenly has glowing eyes, other characters will be curious and it can drive the plot as they try to figure out what's going on.
In Naruto salamander contract fanfiction, a typical plot device is the rivalry. Maybe there's another ninja who also wants the salamander contract and there's a competition between them. Also, the salamander contract might be used as a way to unlock a greater mystery in the Naruto world. For example, it could be linked to an ancient prophecy that the main character has to fulfill with the help of the salamander powers.
One common plot device is the use of Naruto's friends to help him. For example, Shikamaru might come up with a brilliant plan to deceive those arranging the marriage. Another is Naruto's own unique ninja abilities. He could use his shadow clone jutsu to create distractions. Also, there might be a secret enemy behind the arranged marriage that Naruto discovers during his attempts to escape, which adds an element of mystery.
Training with a powerful mentor is a common plot device. For example, in many fanfictions, Naruto might train with an ancient sage or a long - lost relative who has powerful techniques to pass on. Another is the discovery of a hidden power or ability. This could be something like a new form of chakra or a long - forgotten jutsu.
Another plot device is the mystery surrounding the origin of the demon arm. In many fanfictions, the arm's origin is not clear at first. It could be related to an ancient curse, a long - forgotten experiment, or a connection to a powerful and malevolent being from Naruto's world's past. Writers use this mystery to keep readers hooked as Naruto tries to uncover the truth about his arm.