In fanfiction, Naruto sacrificing himself for Obito could be a very emotional and dramatic concept. It might show Naruto's ultimate selflessness, believing that Obito is worth saving at the cost of his own life. This could be due to Naruto seeing the good in Obito that others might not, like the part of Obito that was once a kind - hearted shinobi.
One possible outcome could be that the Hidden Leaf Village enters a period of great mourning. Naruto is a hero to them, and his sacrifice would leave a huge void. His friends like Sasuke might be filled with regret for not being able to stop him. They could also be inspired by his selfless act and strive to protect the village even more fiercely in his memory. Kurama, on the other hand, might be filled with a sense of guilt and a newfound determination to protect the village in Naruto's absence.
The characters' reactions would be complex. For instance, Iruka Sensei, who was like a father figure to Naruto, would be inconsolable. He has watched Naruto grow from a troublemaker to a hero, and this sacrifice would be too much to bear. Shikamaru, being Naruto's friend, would feel a mix of admiration and sadness. Admiration for Naruto's selfless act but sad that he's gone. The kids in the village who looked up to Naruto would be inspired in a way. They would want to be like Naruto and protect the things they love, even if it means sacrificing themselves.
In the fanfiction, Naruto might sacrifice himself for Sakura in a more selfless act of love. For example, if Sakura is afflicted by a deadly curse and the only way to break it is for someone to transfer all their life energy to her. Naruto, being the selfless hero he is, decides to do it without hesitation. This would then explore how the other characters react to his loss and how Sakura copes with living on with Naruto's gift.
When Batman sacrifices himself in fanfiction, it can also be a way to explore the darker side of Gotham. Maybe his sacrifice was in vain, and the city falls deeper into crime and corruption. Or perhaps it leads to a new kind of hero emerging, inspired by Batman's last act. It could also show how the villains react, some might be glad that their nemesis is gone, while others may feel a strange sense of loss as Batman was always a worthy opponent.
In fanfiction where Batman sacrifices himself, a frequent theme is the power vacuum. With Batman gone, who will control the criminal underworld? Will new heroes or villains rise to power? Another theme is the emotional turmoil of the supporting characters. Alfred, for example, has to deal with the loss of someone he considered like a son. And the theme of hope can also be explored. Does Batman's sacrifice give the people of Gotham a new sense of hope, or does it shatter their faith in heroes?
In the fanfic, it could be that Fleur is in a situation where she has to perform a dangerous task to save the wizarding world, like going into an ancient and deadly magical place. Harry, realizing the importance of her mission and also having deep feelings for her (maybe a secret love), sacrifices his own safety by going with her and ultimately giving his life to ensure she can complete the task and save everyone.
There were many anime plots where the male lead sacrificed himself to save everyone, such as Naruto, Reaper, Inuyasha, and so on. In these works, the male protagonist usually had great strength and ability. In order to protect the world or save more people, they would make some sacrifices, even sacrificing their own lives. This kind of plot would often shock and move the readers, and also leave a deep impression on the male protagonist.
Many anime works had plots where the male lead sacrificed himself to save the world.
1. The male lead in Death Note, Yagami. In the process of using the Death Note to kill criminals, he sacrificed himself to protect others and became the "Guardian of the Death Note".
2. The male protagonist's principle of equivalent exchange in 'Metal Alchemist'. He sacrificed himself in various adventures related to the principle of equivalent exchange to achieve his goal.
3. Alan, the male lead in 'The Attacking Giant.' He sacrificed himself to protect humans in the battle against the giants and became the representative of the Giant Hunter.
These works all had profound topics and touching plots. Through the sacrifice and struggle of the male lead, they explored the problems of human nature, values, life and death, etc.
One possible plot could be that in a world filled with dark forces threatening all Pokémon, Ash discovers a way to save Mew who holds the key to restoring balance. Ash, being the selfless hero, decides to sacrifice himself to protect Mew from an oncoming, unstoppable attack. This act of sacrifice then becomes a legend among Pokémon trainers, inspiring others to be brave and selfless.