Well, if Naruto absorbs Mizuki in fanfiction, it could be really interesting. Naruto is already quite powerful, but with Mizuki's essence added to him, his power level could skyrocket. He might be able to access new forms of chakra or have enhanced physical abilities. Also, it could create a whole new dynamic in his relationships. His friends might be a bit wary of this new Naruto at first, but then come to accept him as he still has his core self intact.
In this kind of fanfiction, Mizuki might save Naruto from a dangerous enemy attack. Maybe he uses his own skills to fight off the attackers who are about to harm Naruto.
I really liked 'Mizuki's Redemption Arc'. In this fanfic, Mizuki realizes the error of his ways after his initial betrayal. The author does a wonderful job of writing Naruto's reaction to Mizuki's attempts at redemption. It's a heartwarming story that shows the power of forgiveness in the Naruto universe.
It's possible that Mizuki has had a change of heart. He might have seen the error of his ways in the original story and now wants to make amends by saving Naruto. He could have reflected on how his actions in the past were wrong and this is his way of redeeming himself. In this fanfiction, he might be trying to create a new, positive relationship with Naruto based on mutual respect and friendship.
Well, there are different ways it can happen in fanfiction. One way could be that Naruto and Mizuki are in a battle, and during the fight, Naruto accidentally activates a latent ability that allows him to absorb Mizuki. Maybe there is some sort of ancient seal on Naruto that reacts to Mizuki's presence and starts the absorption process. Another possibility is that Naruto is exposed to a strange chakra - infused object that was once connected to Mizuki, and this object triggers the absorption.
A good Naruto and Mizuki fanfiction often has well - developed characters. Since Mizuki is a complex character with his own motives, exploring his psyche deeper than in the original series can make for an interesting story. For example, if the fanfic delves into his past and how it shaped his actions towards Naruto.
One interesting Naruto and Mizuki fanfiction could be where Mizuki has a change of heart after his initial betrayal. Maybe he realizes the error of his ways and tries to make amends with Naruto. This could lead to them teaming up in some unexpected adventures in the Hidden Leaf Village.
Well, a frequent theme is the exploration of the power dynamic between Mizuki and Naruto. Given Mizuki's initial antagonistic role towards Naruto, fanfictions might play with how that changes. Also, the theme of secrets and revelations can be common. For example, Mizuki might have some secrets that are gradually revealed to Naruto, which then impacts their relationship in the context of the 'lemon' - like situation, which could be about emotional or physical closeness.
Yes, it could be considered a relatively new concept as the amount and variety of fanfiction has exploded in recent years, and the idea of Naruto 'absorbing' these diverse fan - created ideas is something that has emerged as a result of the growing and evolving fan culture.