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.
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.
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.
The theme of self - discovery also frequently appears. As the OC gets involved with Mori, they often discover new aspects of themselves. This could be in terms of their own courage, as they face the challenges of being part of the Host Club world, or their own capacity for love as they interact with Mori on a deeper level.
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.
The male OC could be an undercover journalist. He joins the host club to expose the so - called 'extravagant lifestyle' of the rich students. As he spends more time in the club, he starts to understand the real personalities behind the hosts and realizes that there's more to them than just their wealthy facades. This could lead to a story full of self - discovery and unexpected friendships.
One idea could be an OC who is a new transfer student at Ouran. She's a bit of a tomboy and accidentally stumbles into the Host Club room while looking for the library. The Host Club members are intrigued by her unique style and she ends up becoming a regular visitor, slowly forming a special bond with Tamaki. She could introduce them to new hobbies like skateboarding.
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.
First, think about his background. Is he from a wealthy family like most of the characters in the show, or is he a scholarship student? His family background will influence his personality and motives. For instance, if he's from a poor family, he might be more determined to succeed in the club to improve his financial situation. Then, consider his skills. Maybe he's an excellent dancer or singer, which can be used to draw in clients. Also, don't forget his relationships. Decide who he will be friends with, enemies with, or have a romantic interest in within the club.