One idea could be an OC who is a transfer student from a different country with a unique cultural background. This could lead to interesting interactions with the Host Club members as they learn about new traditions and values. For example, the OC could introduce them to a different style of tea ceremony or a new form of dance.
Maybe an OC who is a talented artist but extremely shy. The Host Club discovers the OC's talent and tries to bring them out of their shell. They could hold an art exhibition within the school to showcase the OC's work, which would also attract a lot of attention from other students and create some fun and flirty moments among the club members and the OC.
Another plot could be that Harry is mistaken for someone else at Ouran. He then has to navigate through the misunderstandings while also trying to figure out how the Ouran world, with its own set of rules about class, social status, and relationships, compares to his world at Hogwarts. There could be a lot of comical moments as he tries to fit in without revealing his true identity as a wizard.
One idea could be that Inuyasha gets transported to the Ouran High School world. He'd be this wild and rough - around - the - edges character in a posh, refined school setting. Maybe he mistakes the Host Club for some sort of demon - like group at first and tries to fight them. Another plot could involve a character from Ouran getting dragged into Inuyasha's feudal Japan world and having to adapt to the lack of modern conveniences and the presence of demons.
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.
One idea could be to create an OC who is a foreign exchange student at Ouran. This OC could bring in different cultural elements and have unique interactions with the host club members. For example, they might introduce new types of food or music. Another idea is an OC who has a secret talent, like being an amazing artist or a martial artist, and how they use this talent within the context of the host club. Maybe they use their art skills to create beautiful backdrops for the club's events or their martial arts to protect the club members in some comical situations.
One idea could be a time - travel plot. For example, a character from modern times somehow gets transported into the world of Ouran Academy Host Club. They could use their modern knowledge to create new and exciting events in the club, like introducing new types of hosting styles inspired by today's pop culture. Another plot could be a 'what - if' scenario. What if Haruhi was actually a rich heir all along but was hiding it for some reason? This could lead to a whole new set of relationships and drama within the club.
A 'what - if' scenario where Haruhi is actually from a wealthy family but has been hiding it all along. This would add a new layer of mystery and drama to the relationships within the host club.
One popular plot idea could be the male OC being a new transfer student at Ouran Highschool who accidentally stumbles upon the Host Club. He has a unique talent, like being an amazing pianist, which catches the attention of the club members and clients alike. Another idea is that the male OC has a mysterious past that slowly unfolds as he becomes part of the Host Club, adding an element of intrigue to the story. Maybe he's related to one of the existing characters in a way no one expected.
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 idea could be that Harry Potter, as the Master of Death, somehow gets transported to the Ouran High School world. He could use his magical abilities in unique ways there, like using the Invisibility Cloak to play pranks on the Host Club. Maybe he'd also share his experiences with death and resurrection with the Ouran characters, leading to some deep philosophical discussions.
A crossover with a detective anime would also be cool. The host club gets involved in solving a mystery. Maybe Haruhi could use her practical thinking skills to help the detective figure out the clues, while the other host club members provide distractions or use their unique personalities to get information from suspects.