One idea could be an OC who has a special ability to communicate with Digimon in a unique way, like through music. This OC could use this ability to bridge misunderstandings between the DigiDestined and some new, misunderstood Digimon species in the tri universe.
Perhaps an OC who is from a different dimension but gets trapped in the Digimon Adventure tri world. They have to figure out how to get back home while also getting involved in the events of tri, like the battles against the new villains. They could bring some unique technology or knowledge from their dimension that helps the DigiDestined.
An OC could be a Digimon researcher who has been studying the abnormal Digimon behaviors in the tri series. They join the DigiDestined on their adventures to get closer to the Digimon for research. Along the way, they discover secrets about the Digimon's evolution and the connection between the digital and real worlds that the others hadn't noticed before.
To create a memorable OC, think about their motivation. If they are in the Digimon Adventure tri world, what do they want? Is it to find a missing Digimon? Or to stop a certain Digimon from causing chaos? Also, consider their relationships. They could have a rivalry with one of the existing DigiDestined characters that adds drama. And don't forget about their skills. Maybe they are a great hacker and can use that to their advantage in the digital world.
One idea could be an OC who has a unique bond with a Digimon that's not a typical partner. For example, an OC who can communicate with wild Digimon and uses this ability to stop an evil force from disrupting the Digimon world. Another plot could involve an OC Digimon Hunter who discovers a hidden power within themselves during a dangerous mission. Maybe they can temporarily fuse with their Digimon partner to gain super strength and defeat a powerful enemy.
Maybe a crossover where the Frontier kids meet the original Digimon Adventure group. There could be a conflict at first due to differences in their ways of handling Digimon and the digital world. But then they realize they need to work together to stop a new and powerful evil Digimon that is threatening both of their worlds. They could learn from each other's strengths and strategies.
There are fanfictions where the OC is from a different world entirely and gets dragged into the Digimon Adventure 01 universe. For example, an OC from a high - tech world suddenly finds themselves in the Digital World with no knowledge of how things work there. They have to quickly adapt and learn about Digimon, and in the process, they might introduce new concepts or technologies from their own world that change the way the adventure unfolds.
One idea could be an OC who has a special ability to communicate with Digimon in a unique way, like through dreams. This could lead to the OC being sought after by both good and bad Digimon groups. Another could be an OC that comes from a different dimension and has to adapt to the Digimon Data Squad's world while bringing in new types of Digimon from their own dimension.
One idea could be to create a female OC who is a transfer student from another country. She could have a unique digimon partner, like a Digimon that is not very common in the Digimon Adventure 02 world. For example, a Floramon that has some special powers related to healing and nature. Her personality could be shy at first but as she bonds with the DigiDestined, she becomes more confident.
An interesting concept could be an OC who is initially afraid of Digimon but is forced to team up with one. As they journey together, they gradually overcome their fear and develop a deep bond, learning important life lessons along the way.
One idea could be creating an OC that has a unique bond with a Digimon not often seen in the series. For example, an OC who forms a partnership with a Vaccine - type Digimon but has an ability that is more associated with Virus - type Digimon. This could lead to interesting plotlines about acceptance and breaking stereotypes within the Digital World.
Each episode of Digimon Adventures was a separate chapter, so there was no fixed number of episodes that could be used as a chapter. The title and content of each chapter were different, and the title and content of each episode were related to the previous game.
One interesting Digimon Tri fan fiction could be 'The Lost Digidestined'. It explores an alternate storyline where one of the main characters gets separated from the group and has to find their way back while facing new and unexpected Digimon threats. Another good one is 'Digimon Tri: The New Alliance' which focuses on how the Digidestined form new partnerships with different Digimon to combat a powerful emerging evil. And there's also 'Digimon Tri: A Different Perspective' that tells the story from the point of view of a minor character in the original series, giving fresh insights into the events of Digimon Tri.