Maybe the Hufflepuff male OC is an exceptional flyer, even though Hufflepuff isn't known for Quidditch. He tries out for the team and faces discrimination from some of the other houses at first. But through his hard work and kind nature, he not only makes the team but also helps to bring unity among the different houses in the Quidditch matches.
Another plot could be that Hermione, being the brilliant witch she is, gets sorted into Hufflepuff by mistake (or maybe it's not a mistake). She initially struggles with the idea as she has always identified more with Gryffindor. But as she spends time in Hufflepuff, she realizes that the house values are just as important and noble. She then uses her intelligence to help Hufflepuff gain more recognition in the wizarding community.
Well, a plot could be that the male OC is a time - traveler. He arrives in Camelot during Merlin's time and has knowledge of future events. This causes a stir as Merlin tries to figure out if he can trust this stranger. Maybe the OC is from a future where magic has been fully accepted and he tries to bring that ideology to Camelot. Or perhaps the male OC is an artist who uses magic in his art, and his works start to have strange effects on the people of Camelot, leading Merlin to investigate.
One idea could be a male oc who is a new student in Riverdale. He has a mysterious past related to a big city crime syndicate. As he tries to fit in at Riverdale High, he gets involved with the core group of friends. Maybe he has some special skills like being an expert in martial arts or a whiz at hacking, which he uses to help solve the town's mysteries. Another plot could be that he is an aspiring musician who gets caught up in the drama between the music clubs at school and the local music scene in Riverdale. He could also have a romantic sub - plot with one of the female characters, like Betty or Veronica, but there are obstacles in their relationship due to his secrets.
A great plot could be that the male OC is a street magician in Gotham. One day, he discovers that his magic tricks are actually real magic due to an ancient artifact he found. He then uses this magic to fight crime, but he has to keep it a secret from the authorities and the criminal underworld. Or perhaps the male OC is a detective who has a unique ability to see the memories of the dead. This helps him solve crimes that no one else can, but it also takes a toll on his mental health as he is constantly exposed to the trauma of the victims. Another plot could be that he's a young heir to a wealthy family who decides to use his family's resources to fight against the poverty and crime in Gotham instead of living a life of luxury.
A plot could involve the male OC being a long - lost relative of one of Artemis' allies. He shows up unexpectedly and has a mysterious past. Artemis is initially suspicious of him but as they work together to solve a series of strange disappearances in the forest, she begins to trust him. They discover that an ancient evil is behind the disappearances and must combine their skills to defeat it. Maybe the male OC has some knowledge of ancient magic that Artemis needs to learn.
One idea could be that the male OC with the Omnitrix accidentally gets transported to an alternate dimension where the Omnitrix functions differently. He has to figure out how to adapt and use it to get back home. Another plot could involve the OC using the Omnitrix to stop an alien invasion that is targeting his hometown specifically. Maybe the aliens are after the Omnitrix's power source.
A plot could revolve around a mystery within the Hufflepuff course. For example, a hidden secret about the founder, Helga Hufflepuff, is embedded in the curriculum. A group of students teams up to unravel this mystery, facing challenges that test their Hufflepuff values like hard work and patience along the way. They could find a long - lost spell or artifact related to the founder.
One idea could be a male OC who is a transfer student with a unique playing style that challenges the established teams in the 'Kuroko no Basket' universe. For example, he might have a special ability to read the opponents' moves in an extraordinary way, like being able to predict not just the next pass but also the emotions behind each player's actions, which adds a new layer of psychological warfare to the games.
One idea could be an Uzumaki male OC who discovers a hidden Uzumaki jutsu that was lost over time. He has to master it while also facing the challenges of being an outsider in the village as many are suspicious of his new power. Another plot could involve the OC having to form an alliance with the Akatsuki to save his family, but he has to keep his true motives hidden from them. Or perhaps the OC is on a quest to find out the real reason behind the destruction of the Uzumaki clan and uncovers some dark secrets along the way.
Maybe a male OC who is a healer. He joins Yona's group and uses his unique healing abilities to help the team in various situations. He also has a crush on one of the female characters in the group, which adds some romantic sub - plot.