Self - discovery is a common theme. When Naruto is alone, he has time to think about who he is and what he wants to become. Another theme is growth. He has to become stronger on his own without relying on his friends all the time.
Naruto might cope by focusing on his goals. He's always been determined, so he could pour all his energy into achieving something in the modern world, like getting an education or mastering a new skill.
Well, it might show Naruto in a modern setting, all alone, perhaps because he's the only one with his unique abilities. He could be constantly on the run from people who want to study or use him. And as he's alone, he'd have to learn to rely on himself in ways he never had to in the Naruto universe. He'd also likely have internal struggles as he misses his old friends and life.
Well, in such a fanfic, Naruto might focus on mastering a new jutsu. He could be in a secluded area, like the forest near the village. He would practice over and over, facing challenges like controlling his chakra better. Maybe he'd also be thinking about how to become stronger to protect his friends and the village.
Naruto would likely be portrayed as a bit melancholy at first. He's used to being around his friends, and being alone on Christmas makes him feel a bit left out. But he still has his positive attitude deep down. He might be shown looking at the Christmas lights in the village with a sense of longing, yet also determination to make the best of the day.
He could meet an old hermit who has some unique knowledge about chakra control. This hermit might be living deep in the forest where Naruto is training. The hermit could give Naruto some tips on how to better manage his chakra during his intense training sessions.
In many such fanfics, it might show Naruto's early days in the village more harshly. Maybe it details how he was truly isolated, with no one to share his meals or his dreams. For example, it could describe his evenings alone in his small apartment, longing for a family or a friend to talk to.
He could develop a sense of independence that is different from his usual teamwork - oriented self. In the face of being alone in modern Konoha, Naruto may start to rely more on his own judgment and skills. He might learn new jutsu or ways of thinking that he didn't have the chance to explore when he was always with others. This could also make him a more complex and nuanced character as he faces challenges on his own.
One possible plot could be Naruto reflecting on his past Christmases. Maybe he remembers all the times he was alone while others were with their families. He could then decide to go on a self - discovery journey around the village on Christmas day, seeing how others celebrate and finally realizing that he has his own kind of family in his friends, even if they are not physically with him at that moment.
She might be initially shocked and hurt. Sakura has always had Naruto as a constant in her life, so his sudden absence would be difficult to accept. She could become withdrawn and start to question her self - worth.