One idea for an OC in Katekyo Hitman Reborn could be a gamer who has the ability to use video game skills in the real world of the series. For example, they might have a 'health bar' that others can see, and they can level up their combat skills like in a game. This would add an interesting dynamic to the story as they interact with the existing characters.
There could be a fanfic that focuses on a romantic relationship between a character from Katekyo Hitman Reborn and Sakura. Let's say Hibari falls for Sakura when she stumbles into his territory. He is initially hostile but then gradually becomes interested in her unique charm, and the story could explore how their relationship develops against the backdrop of the Reborn world.
Begin with the stories recommended by other fans. There are often forums and groups dedicated to Katekyo Hitman Reborn where fans discuss their favorite fanfictions. These recommendations can lead you to some really great reads. Also, consider looking for stories that focus on your favorite characters from the series. For example, if you like Tsuna, look for fanfictions that center around him.
Fanfiction in these two can be about relationships. It could be romantic relationships, like shipping certain characters in Katekyo Hitman Reborn. Maybe a story about Gokudera and Yamamoto's friendship evolving into something more. In Dark Hunter, it might be about the complex relationships between the hunters and the creatures they hunt. There are also action - packed fanfictions that expand on the battles and combat scenarios in both series.
One possible fanfiction could be where Tsuna and Chrome go on an adventure together to find a special item in the Katekyo Hitman Reborn world. They might face various challenges along the way and their relationship could grow stronger as they rely on each other's skills.
One tip is to start with popular ones. Usually, the more popular fanfics have engaging plots. Another is to look for well - rated ones. High ratings often mean that other readers have enjoyed them. Also, try to find fanfics that focus on your favorite characters from Katekyo Hitman Reborn, as it'll be more interesting for you.
I really like the ones that focus on character interactions. Imagine Lambo from 'KATEKYO HITMAN REBORN' meeting Kuro from 'SERVAMP'. Lambo's childish and unpredictable nature combined with Kuro's laid - back but protective attitude towards Mahiru could lead to some really hilarious and heartwarming scenes. These crossovers often bring out new sides of the characters that we don't usually see in their original series.
When writing a 'Katekyo Hitman Reborn Reader Insert Fanfic', it's important to keep the reader's character relatable. Don't make them too overpowered from the start. Let their abilities or skills develop gradually. Also, make sure to include plenty of interactions with the original characters. For example, you could write a scene where the reader has a conversation with Reborn about their future in this dangerous world. Another aspect is to create a plot that is both interesting and fits within the framework of the Katekyo Hitman Reborn world. Maybe there's a new threat that the reader and the Vongola family have to face together.
I really like 'A New Beginning in Katekyo Hitman Reborn Reader Insert'. It's unique because it focuses on the reader character having special abilities that are different from what we usually see in the fandom. The story also has some great interactions between the reader and the main characters like Tsuna.