Friendship is a very common theme. Boruto and Mitsuki have a deep bond that is often explored in these fanfics. Another theme is growth. They both grow as ninjas and as individuals, and this is shown through their experiences together. Also, loyalty is often depicted, like Mitsuki's loyalty to Boruto.
One popular 'Boruto x Mitsuki fanfic' is 'Bond Beyond Comrades'. It delves deep into their relationship as they face various challenges in the Hidden Leaf Village. The story shows how they support each other and grow stronger together. Another great one is 'The Unbreakable Bond'. It focuses on their adventures outside the village and how their friendship evolves into something more special.
Boruto's reaction would be complex. He'd be heartbroken, for sure. He might start to question his own worth and purpose. But over time, he'd realize that he has to carry on Naruto's legacy. He'd become more serious and focused. He'd also become more empathetic towards others, understanding the weight of sacrifice. He might even start to study Naruto's techniques and leadership style more closely, trying to emulate the things that made Naruto such a great Hokage and hero.
In this fanfic, the new teacher might have a mysterious past. This could lead to some interesting plot twists. For example, the teacher could be related to an old enemy or have a secret mission that involves the students. Boruto, being the adventurous type, would be the first to try and uncover the teacher's secrets. Sarada would be more cautious and Mitsuki would be observing everything with his calm demeanor.
Boruto's determination and his desire to make his own mark, different from his father Naruto, can be a great starting point. He's headstrong and often rushes into things, which can create interesting situations. Mitsuki, on the other hand, is calm and calculating. His mysterious origin and snake - like abilities add an element of intrigue. In fanfiction, their opposite personalities can lead to great character development as they interact and learn from each other.
Boruto might be in awe. He has always known his father as the Hokage, a powerful and respected figure. Seeing Naruto's past full of struggles, loneliness, and determination would make him realize how far his father has come. It could also make Boruto more empathetic towards Naruto and perhaps inspire him to be more like his father in some ways.
Some fans might like it. They could see it as a way to show Naruto's strict parenting side and how he is trying to instill good values in Boruto. It would add a new dimension to their relationship.
He may try to understand Boruto's reasons. Naruto has always been one to look for the good in people. So, even when hurt, he might give Boruto the chance to explain himself. He could say something like 'Boruto, I know you didn't mean it. Let's talk about what's wrong.' He'll be patient and try to resolve the issue rather than getting angry right away.