In such a fanfiction, Sonic could be experimented on to try and find a way to transfer his powers to others. The story might involve a group of villains who believe that if they can harness Sonic's speed, they can rule the world. So they subject Sonic to all kinds of unethical experiments, which he has to endure while also trying to find a way to escape.
In 'sonic gets experimented on fanfiction', one possibility is that the experimenters are from an alien race. They might be curious about Sonic's abilities which are far beyond what they've seen in their own world. So they capture him and start running all sorts of tests on him, from physical examinations to tests on his cognitive abilities.
One possible scenario could be that Sonic is shot by a robotic enemy while trying to protect his friends. He might then have to rely on his friends to get him to safety and find a way to heal his wound. Another could be that he's shot by a misfiring weapon of a friendly character, leading to a lot of guilt and a race to save Sonic's life.
It could be Dr. Eggman. He's always been after Sonic and trying to defeat him. Experimenting on Sonic could be his new way to find Sonic's weaknesses or to gain his powers for himself.
In such a fanfiction, one possible scenario could be that Naruto is experimented on for his unique chakra. Maybe Konoha scientists, in a bid to understand the power of the Nine - Tails within him, conduct various tests that are both physically and mentally taxing for Naruto.
Well, it's possible that in the fanfiction, Naruto is experimented on as part of a desperate attempt to save the village. There could be a new threat on the horizon, and the village elders or some ninja with knowledge of forbidden techniques believe that by experimenting on Naruto, who has shown great resilience, they can find a solution. They might be trying to turn him into a weapon or a shield for the village, which would put Naruto in a really tough situation both physically and morally.
One possible scenario could be that in the fanfiction, some evil organization captures Percy and tries to figure out his powers related to being a demigod. They might subject him to various tests like trying to measure the limits of his ability to control water, or how he can heal from injuries that would be fatal to normal humans. Another could be that they experiment on his connection to the Greek gods, perhaps trying to sever or manipulate it in some way.
One possible scenario could be that the experimenters are trying to enhance Robin's physical abilities. Maybe they use some sort of advanced technology or strange serums. Another could be that they are trying to access his memories, perhaps related to Batman's secrets or the inner workings of the Young Justice team. It could also be an experiment to test his mental resilience under extreme stress.
One possible scenario could be that Princess Jasmine is kneeling to show respect to a powerful magical being she encounters. Another might be that she kneels in a moment of deep prayer or meditation within the story's context.
Well, he could gain some new and unexpected powers. Maybe he discovers a way to enhance his chakra control to an extreme level, allowing him to perform jutsus with much greater efficiency and power.
In 'naruto gets angry fanfiction', one possible scenario could be that Naruto gets angry when he discovers someone has been mistreating his friends in the village. He might immediately confront the wrongdoer with his signature rasengan at the ready.
Maybe he gets mad when his friends are in danger. For example, if Videl is threatened by a powerful villain, Gohan's protective nature kicks in and he gets really mad.