Does Mizuki ever reappear in the manga?

I don't have the exact answer for that. The outcome of their relationship could be influenced by various factors within the manga's story. You might want to look into the latest chapters or consult with other manga enthusiasts.

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.

Yes, Yato does rage on some occasions in the manga.

Sure. The value of manga can go up depending on factors like its rarity, popularity, and condition. For instance, first editions or signed copies of popular series might become more valuable over time.

Saitama doesn't lose in the manga. He's basically unbeatable with his insane strength.

Sure, manga can become really popular. Many manga series have gained huge fan followings worldwide.

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.

Yes, he does. Thorfinn gets into fights later in the manga as the story progresses.

Well, Taiju does confess to Yuzuriha. It happens after a series of events that build up the tension and make the confession quite impactful. The scene is beautifully depicted in the manga.

No, Ains doesn't get stopped. He's pretty much dominant throughout the manga.