Another plot is where the girl is in some sort of self - imposed danger, like she's lost in a dangerous area or has made a deal with a bad guy. Naruto then has to use his wits and strength to not only save her physically but also get her out of the bad situation she got herself into. In some fanfictions, this also leads to the girl having a change of heart and becoming a better person thanks to Naruto's influence. This plot is interesting as it shows Naruto as a positive influence on others.
There's a fanfiction titled 'Saving the Girl from the Darkness'. In it, Naruto discovers a girl who has been trapped in a genjutsu for years. His own experience with loneliness and his strong will allow him to break through the genjutsu and save her. The story delves deep into Naruto's character, showing how his past traumas have made him more empathetic and determined to help those in need.
Well, the action scenes are often a highlight. When Lelouch uses his wits and abilities to outsmart the bad guys and reach the girl in time, it's really exciting. For example, in some fanfics, he might use his Geass power in a creative way to save her.
They're popular because they often play on the idea of chivalry. People like the concept of a hero (the boy) coming to the rescue of a damsel in distress (the girl). It gives a sense of security and romance.
They might end up enemies. For instance, if the merman has a different view on humans after being saved. Maybe he thought humans were all bad before, but now he's conflicted because this girl saved him. Or perhaps the girl accidentally reveals the merman's existence to others, which angers the merman and his kind.
In the 'Tony saves the neighbor girl Kat and sisters' story, it could be that Kat and her sisters are being harassed by some bad guys. Tony, being a kind - hearted and brave person, steps up. He uses his wits and strength to fend off the bad guys and saves the girls. He might take them to a safe place and make sure they are okay.
Well, one possibility is that the merman becomes indebted to the girl. He might then use his merman powers, like being able to communicate with sea creatures, to help the girl in some way. For example, if the girl's village is facing a shortage of fish, the merman could guide the fish back to their shores.
In the fanfiction, it could be that the Power Ranger has some sort of psychic connection to the girl. Maybe he was in the area and his heroic instincts kicked in. He could then use his communication skills, which are part of his heroic toolkit, to talk the girl out of it. He might share his own stories of facing difficulties and overcoming them, making the girl realize that there is hope.
This was an urban novel about the protagonist accidentally killing a hostage, but the rescued little girl became the hostage's sister and came to take revenge.
The protagonist was a security guard in a mall, and he was deeply remorseful and guilty for killing a criminal by mistake. However, when he rescued the kidnapped little girl, he found out that she was a security guard in the mall like him.
The little girl was very smart. She quickly discovered her identity and the protagonist's guilt and pain. She decided to take revenge with her hatred and use her intelligence to help the protagonist get out of trouble and regain his freedom.
The protagonist gradually let go of his psychological burden in his relationship with the little girl, realized his mistakes, and began to reconsider his life. After experiencing all kinds of difficulties with the little girl, he finally walked out of the haze and started his own life again.