Another way Naruto could cope in fanfiction is by turning to an older mentor figure. Maybe Iruka -sensei notices what's going on and takes Naruto under his wing more than in the original story. He gives Naruto extra training and advice on how to deal with the bullies, which helps Naruto grow stronger both physically and mentally.
He might also cope by making a few true friends. There could be a character who sees Naruto for who he really is and stands up for him. Together, they form a bond that helps Naruto endure the bullying. This friendship becomes a source of strength for him.
In some fanfictions, Naruto might cope by finding a hidden talent. For example, he could discover he's really good at a particular ninja art that others haven't noticed. This newfound skill gives him confidence and makes the bullies less intimidating.
Well, in some fanfictions, Percy's experiences with monsters actually help him with the bullies. He has faced far scarier things than school bullies. So, he kind of sees them as just another nuisance. He may not even take their taunts seriously because he knows his own worth. He's a hero in the making, and these bullies are just small - time annoyances compared to the quests he's been on.
At first, Naruto may be heartbroken and confused as to why he is being bullied. He might cry in private, but in public, he tries to put on a brave face. As time goes on, he realizes that he can't let the bullies control his life. So, he tries to find friends who will support him, like Shikamaru or Choji. With their help, he begins to stand up to the bullies more effectively and also works on building his own self - confidence.
He might cope by throwing himself into his work or hobbies. For example, if Percy is into some kind of art or sport, he could focus all his energy on that. This would be a way for him to distract himself from the pain of being cheated on.
He could also react with confusion. Natsu is a bit of a simple - minded character in some ways, and he might not understand why someone would want to bully him. This confusion could lead to him trying to figure out the bully's motives.
It could also be his boisterous personality. Naruto is very outgoing and sometimes a bit of a troublemaker in his attempts to get attention. This might annoy some of the more reserved or studious kids at school, leading them to bully him as a way to try and make him conform or be quiet.
He might isolate himself at first. Natsu could withdraw from his friends and normal activities, needing time alone to process his pain. This is a common way for people, or in this case, characters, to deal with heartbreak.
Naruto might throw himself into his ninja training. He's always been dedicated to getting stronger, and heartbreak could fuel that drive even more. For example, he could spend countless hours perfecting new jutsu or sparring with his friends. Another way he could cope is by relying on his friends. Sakura and Kakashi, for instance, could be there to support him, listen to him vent, and offer advice. He might also find solace in eating ramen at Ichiraku. The familiar taste and the warm atmosphere of the ramen shop could give him some comfort.
Tsukishima would likely rely on his logical thinking. He'd try to retrace his steps and remember any landmarks he passed. Since he's observant, he might use the things he noticed around him to figure out where he is.
Jason might isolate himself at first. He's a tough character, so he may try to deal with the pain on his own without showing weakness.
However, as the story progresses, Yugi might find his inner strength. He could use his dueling skills not just to win against opponents in the game but also to stand up to the bullies. For example, he might challenge the bullies to a fair duel and show them that he's not someone to be pushed around. His friends, like Joey and Tristan, might also step in to support him, which gives him more courage to face the bullies head - on.