Perhaps 'The Unlikely Bond: Kyoya x OC in Ouran Highschool Host Club'. This title emphasizes the idea that their relationship might be unexpected or different from what one might initially think in the setting of the host club.
Romance is also a big theme. The OC usually gets involved in a romantic relationship with one or more of the host club members. It could be a slow - burn romance or a love - at - first - sight kind of situation.
One plot idea could be that the OC is a new student at Ouran. She accidentally stumbles into the Host Club and catches Kyoya's attention because she's not immediately smitten like other girls. He then tries to figure out her motives and in the process, they start to develop feelings for each other.
One common theme is self - discovery. The OC often enters the world of the Host Club not fully knowing themselves and through their interactions with the club members, they learn more about who they are. For example, in many fanfictions, the OC discovers new magical abilities or aspects of their personality.
The fanfiction 'With Honey by My Side' is also worth checking out. It shows the OC and Honey going through various school events together. The author does an excellent job of creating a believable relationship between the two within the world of Ouran Highschool.
Well, a big theme is the idea of fitting in. The reader, who is often an outsider, tries to find their place within the host club. There's also the theme of transformation. The reader might change in terms of confidence or how they view themselves because of their experiences in the club. And of course, the theme of the high - school social hierarchy is there. The host club is at the top, and the reader has to navigate that world.
There's 'A Host Club Surprise'. In this fanfiction, the OC is a transfer student with a mysterious past. The story unfolds as she gets involved with the host club in unexpected ways. It's full of humorous moments as well as some sweet, romantic undertones.
Well, you could have an OC who is an exchange student from a foreign country. He could bring different cultural elements into the host club, which causes some interesting interactions, especially in a yaoi - centered story. For example, his different view on relationships and his unique charm might attract one of the existing members in a more than friendly way. You could also explore how the other host club members react to this new relationship dynamic.
First, really study the characters of Honey and the overall world of Ouran Highschool. Know their personalities, quirks, and how they interact. Then, create an interesting OC with a unique backstory. For example, your OC could be a transfer student from a different country, which would bring in new cultural elements.