Well, a plot could be that you were reborn as Ash's brother and you remember your past life. You use this knowledge to try and change some of the events that happened to Ash in the original story. Maybe you prevent him from making some of the mistakes he made in his Pokémon battles, or you help him form alliances with trainers he didn't get to team up with before. You could also have a rivalry with some of Ash's enemies, but in a different way than Ash does, adding a new layer of conflict and resolution to the story.
One idea could be that as Ash's brother, you have a special ability that Ash doesn't. For example, you can communicate with a certain type of Pokémon that is very rare. This ability helps Ash in his journey in unexpected ways, like leading him to a hidden Pokémon sanctuary where he can catch some unique Pokémon. Another plot could involve you having a different approach to Pokémon training compared to Ash. While Ash is more about friendship and instinct, you focus on strategy and research, and the two of you combine your methods to become even stronger trainers.
A possible plot is that being reborn as Ash's brother, you are born with a pre - existing bond with a legendary Pokémon. This Pokémon becomes your partner from the start. As you and Ash start your Pokémon journeys, your presence with the legendary Pokémon attracts the attention of various villains. They try to capture the Pokémon, and you and Ash have to work together to protect it. Along the way, you also help Ash understand more about the power and responsibility that comes with being a Pokémon trainer through your experiences with the legendary Pokémon.
Yes, there could be. For example, Lance might train Ash in secret ways of Pokémon battling that are unique to his family. This could lead to Ash having an edge in battles against tough opponents.
One idea could be that they discover their relation early on. Merlin, knowing his destiny, tries to keep Morgana from turning evil by showing her the good in magic. He could secretly teach her positive uses of magic, away from Uther's watchful eye.
One plot idea could be that Naruto and Sasuke grow up knowing they are brothers. They train together secretly, combining Naruto's Uzumaki stamina and Sasuke's Sharingan abilities. This leads to them creating unique jutsu. Another could be that their brotherhood is a secret from the village, and they have to protect this secret while still trying to save the village from threats.
One idea could be that Ash's twin brother was separated at birth and raised in a different region. He might have a different approach to training Pokemon, perhaps focusing more on strategy than Ash's instinctive style. Another plot could involve the twin having a special bond with a rare or legendary Pokemon from the start, which sets him on a unique journey.
One plot idea could be that Ash and Serena discover they're pregnant during their journey. They then have to decide whether to continue traveling or find a safe place to settle for a while. Another could be that they face challenges from Pokémon battles while Serena is pregnant, and Ash has to be extra cautious to protect her and their unborn child.
One plot idea could be that they embark on a journey to find a special place to raise their child. They might face challenges along the way, like dealing with wild Pokémon that are more aggressive due to the new energy they sense. Another could be that they start a Pokémon training school for their unborn child and other kids in the region, teaching them about Pokémon care and battle strategies.
Another plot could involve the reactions of their friends. Pikachu might be really curious and try to help in his own little way. And the other Pokémon friends could also offer their support in different ways, like gathering special berries that are good for Latias during pregnancy.
Sure. In some fanfictions, the revelation of Giovanni as Ash's dad can lead to interesting plot twists. It might make Ash question his own identity and purpose. Also, it could potentially change the relationships between Ash and his Pokémon friends, as they may have to deal with the implications of Ash having such a powerful and often - villainous father.
One plot idea could be that Gaara, as Naruto's protective brother, uses his sand powers to shield Naruto from various attacks during a major battle against a new and powerful enemy. For example, when the enemy launches a surprise attack on Naruto, Gaara quickly forms a sand barrier around him, saving his life. Another idea is that Gaara helps Naruto train in secret to master a new technique. He shares his own experiences with controlling power, which Naruto can relate to with his Nine - Tails chakra.
A possible plot could be that both Naruto and Hashirama are reborn simultaneously. They might team up to face a new, powerful enemy that even the combined forces of the Hidden Leaf couldn't handle before. Since Naruto has his Uzumaki chakra and Hashirama has his Senju power, together they could create new and powerful jutsu. For example, Naruto's chakra could enhance Hashirama's Wood Style to cover larger areas or be more durable.