The moment when Kakashi actually reaches Naruto and stops him from harming himself is crucial. He could use his speed and strength to grab Naruto's hands if he was about to use a weapon on himself. Kakashi's presence alone at that moment can be a shock to Naruto, making him pause and re - consider.
In many fanfictions, Kakashi might save Naruto from suicide by using his Sharingan. He could see Naruto's inner turmoil and use his jutsu to snap Naruto out of his dark thoughts. For example, he might use a genjutsu to show Naruto all the people who care about him and how much he means to the village.
One possible antagonist could be the Akatsuki members. They are always looking for strong opponents or valuable information. Maybe they target Iruka because they think he has some knowledge about Naruto that they can use, and Kakashi has to stop them.
In such a fanfiction, perhaps Kakashi might save Iruka from a dangerous enemy like Orochimaru's minions. Kakashi, with his Sharingan and powerful jutsu, could arrive just in time to fend off the attackers.
In some fanfictions, Naruto saves Kakashi from the brink of death. For instance, Kakashi could be poisoned by a rare and deadly toxin. Naruto, with his determination, goes on a quest to find the antidote. He overcomes many obstacles, battles different creatures, and finally retrieves the antidote to save Kakashi. This showcases Naruto's loyalty and his growth as a shinobi.
When Naruto saves Kakashi, it often shows his growth in terms of leadership. He has to take charge of the situation, which is different from his earlier, more impulsive self. For example, if he has to organize a rescue mission, he learns to plan and delegate tasks to others.
It might also make Kakashi more protective of Naruto in the future. He realizes how important Naruto is not just to the village but also to him personally. So, he may be more involved in Naruto's training and growth.
One possible antagonist could be Orochimaru. He has always been interested in Naruto for his Nine - Tails power, so it would make sense for him to be a threat that Kakashi has to protect Naruto from.
It could be that Percy has been ostracized or misunderstood by the people he cares about. If his actions were misinterpreted and he was made to feel like an outcast, that might have led to his suicidal thoughts. Also, he might be suffering from some kind of prophecy or fate that seems inescapable, and he thinks death is the only way out.
Well, perhaps she notices his extreme withdrawal. He might stop participating in things he used to love, like Quidditch. His conversations become very sparse and he always seems lost in his own dark thoughts. Ginny, being perceptive, picks up on these signs.