One possible plotline could be that Tails is killed by a powerful enemy during a battle to protect his friends. Maybe a new, extremely strong villain emerges and Tails sacrifices himself to buy Sonic and the others time to escape. Another could be that there is some sort of accident in Tails' workshop while he is working on a dangerous experiment, leading to his untimely death. It could also be that in a dark alternate universe, Tails is targeted and assassinated by an evil organization that wants to disrupt the balance of power in the world he lives in.
In some versions of 'tails gets killed fanfiction', it might be related to a curse. There could be an ancient curse that is awakened in the world, and Tails unfortunately becomes the victim. The curse slowly drains his life force or causes him to be in situations where he can't defend himself. Also, it could be a situation where Tails is trying to solve a mystery that is too dangerous. He gets too close to the truth and the people or forces behind the mystery decide to eliminate him.
One possible plotline could be that Sonic is facing a new and extremely powerful villain who manages to outwit him in a battle and ultimately kill him. This could lead to his friends, like Tails and Knuckles, vowing revenge and setting out on a journey to become stronger to face the villain.
Another plot could involve Tails trying to hide his sickness at first because he doesn't want to worry his friends. But as it gets worse, he can't hide it anymore. His friends then feel guilty for not noticing earlier and they all come together to take care of him and find a remedy.
One possible plotline could be how the other Avengers react to Steve's death. Some might go into deep mourning while others could be driven by revenge. For example, Tony might use his technology to try and find out who was responsible and bring them to justice.
One possible scenario could be that Natsu is killed in a battle against a powerful and unexpected enemy. Maybe a new dark mage appears with powers that can overpower Natsu's fire magic.
Well, perhaps in this fanfiction, there could be a plot where a dark curse is placed on Hinata. As the curse takes effect, she gradually weakens until she finally succumbs and is killed. It could also be that a misunderstanding leads to her being in the wrong place at the wrong time and getting killed accidentally.
One possible plot could be that in a dark, alternate universe, Frisk accidentally wanders into a powerful monster's lair. The monster, feeling threatened by Frisk's presence, attacks without hesitation. Frisk, being human and relatively defenseless, is quickly overpowered and killed. Another plot might involve a betrayal within a group of friends. One of Frisk's so - called friends becomes envious of Frisk's popularity or kindness and devises a plan to get rid of them. They set up a situation where Frisk is in great danger and ultimately meets their demise. A third plot could be related to a curse. Frisk unknowingly breaks an ancient curse that was placed on the land, and as a result, the curse takes their life in a rather cruel and unexpected way.
One possible scenario could be that he is killed in a lightsaber duel by a powerful Sith opponent. Maybe this new Sith has some secret technique that Anakin couldn't counter.
One possible plotline could be that the villagers, out of long - held fear and jealousy of Naruto's growing power, band together in a mob. They might ambush Naruto when he is least expecting it, perhaps on his way back from a mission. Another could be that they are influenced by a powerful and evil - minded individual who manipulates them into believing Naruto is a threat to their safety.
Perhaps in the fanfiction, Percy's death is a sacrifice that was misinterpreted. The gods thought it was necessary for some greater good, but it actually throws the world into chaos. His friends then have to find a way to bring him back and restore order.
Well, it could be that in this fanfiction, Frisk gets bullied because they come from a different background than the others. The bullies target Frisk for being an outsider. As the story progresses, Frisk could meet a mentor - like character who helps them gain confidence and teaches them how to deal with the bullies. Frisk might then use kindness and understanding to turn the situation around and make the bullies realize their mistakes.