If parents come across disturbing content in Descendants fanfiction, they should immediately stop watching it. They can also report the content to the platform where they found it if possible.
Parents can react with understanding. They should create an open environment where the teen feels comfortable to talk. For example, instead of getting angry immediately, they can listen to the teen's feelings and experiences.
Luke might be in awe. He's always been seeking his family and a sense of belonging, so meeting his parents could make him feel complete. He'd probably listen intently to whatever they have to say.
Naruto may also try to find solutions. Despite the heartbreak, his optimistic nature might still shine through a bit. He could start to search for ways to mend the relationship with his parents, whether it's through magic in the Naruto world or by trying to prove his worth to them.
He might be in shock at first. Sly has been on his own for so long that seeing his parents could be overwhelming. He could just stand there, speechless, trying to take in the fact that they are real and in front of him.
Danny might react with panic at first. After all, he has been hiding his identity from his parents for so long. He could try to escape from them, using his ghost powers in a desperate attempt to get away before they can do anything drastic.
Sally would likely be very intrigued. She loves Percy so much and would be eager to explore more of his world through fanfiction. She might be a bit taken aback by some of the more extreme storylines. Poseidon, well, he might see fanfiction as a sort of strange mortal pastime at first. But if he found stories that really delved into his relationship with Percy in new ways, he could become quite interested.
Goku's reaction could be a mix of shock and joy. On one hand, he has been on Earth for so long without any real family connection to his Saiyan side. When he sees his parents, it would be overwhelming. He would likely be in awe of his father, Bardock, given his father's reputation as a strong Saiyan. And he would be eager to bond with his mother, who he has never known. He might also feel a sense of belonging that he has been missing all his life.
In some fanfictions, Naruto may become extremely bitter. He could feel a deep sense of betrayal and this might fuel his determination to become stronger, not for the sake of the village at first, but more for self - vindication. He might isolate himself from others and struggle with his identity.
Timmy's friends' reactions could vary widely. His female friends might be more welcoming and excited to have him as a 'new girl' in their group. They could start inviting him to do girl - only things like slumber parties or shopping. However, some of his male friends who are more set in traditional gender roles might be a bit standoffish at first. But over time, as they see that Timmy is still the same person on the inside, they could come around and accept him in his new form.