Fanfiction.net is also a good place to look. There are many authors who post their arcobaleno oc reader fanfictions there. However, the site's search functionality might not be as advanced as AO3, so you may need to do a bit more digging. You can start by looking at the relevant anime or manga categories and then narrow it down.
One good arcobaleno oc reader fanfiction could be 'The Arcobaleno's New Companion'. It's about an OC who gets involved in the arcobaleno's world in a unique way, with lots of character development and interesting plot twists.
One interesting arcobaleno reader fanfiction could be the one where the reader has a special power and gets involved in the arcobaleno's secret missions. It's exciting as it shows the reader being part of their world and using unique abilities to solve problems.
Ask in fan communities dedicated to the series that features the arcobaleno. The members there are usually very helpful and can recommend some great reader fanfictions. They might even share some hidden gems that are not so easy to find on general search engines.
One idea could be to create an OC who has a unique power related to the Arcobaleno curse. For example, an OC that can temporarily nullify the curse's effects on the Arcobaleno for a short period. This would add an interesting dynamic as the OC would be both a help and a potential target.
One interesting story could be about an OC who discovers a hidden power within the Sky Arcobaleno heritage and has to learn to control it while facing various challenges from other Arcobaleno. It might involve a journey of self - discovery and making unexpected alliances.
Well, you could base your 'new sky arcobaleno oc fanfiction' on a time - travel concept. Have your OC travel back in time to the origin of the arcobaleno and change certain events. This would not only create a complex and engaging plot but also allow for a lot of character development. Or perhaps make the OC a healer, using their sky - related powers to heal not just physical wounds but also emotional traumas of the other characters. This would give a fresh perspective on the arcobaleno world.
First, you need to have a clear understanding of the Sky Arcobaleno concept in the original work. Research their powers, characteristics, and the world they exist in. Then, create a well - developed OC with a unique personality and backstory. Make sure their story fits within the existing lore but also adds something new.
The OC could start as an adversary to Tsuna. Maybe the OC initially misunderstands Tsuna's intentions and sees him as a threat to the balance of the Arcobaleno world. But as time passes, they realize Tsuna's good heart and start to work with him.
First, create a detailed profile for your OC. Decide on their appearance, personality, and backstory. Then, think about how they fit into the arcobaleno world. For example, are they a new addition to the group or a replacement for an existing character? After that, come up with a basic plot idea, like a mission they have to go on or a problem they need to solve.