The OC can stand out by having a distinct personality. For example, if most of the harem members are more on the outgoing and aggressive side, the OC could be calm and collected. Their different approach to situations would make them noticeable. Also, having a unique power or ability that no one else in the harem has would definitely set them apart.
The OC could stand out by being an expert in an area that the harem lacks knowledge in. Say, the OC is a master of ancient languages and can decipher old texts that hold valuable information for the harem's activities. Or they could be an exceptional strategist, able to come up with battle plans that are far more effective than what the harem usually devises. Their physical appearance could also be distinct, not in a clichéd way but in a way that reflects their unique character. For example, they might have a unique hair color or style that is associated with their special abilities or their origin story.
One way for the OC to stand out is through their backstory. If they have a tragic or mysterious past that is slowly revealed, it will pique the interest of Rias and the other harem members. They could also have a different cultural or ethnic background compared to the rest, which would bring in new traditions and ways of thinking. For instance, if the OC is from a long - forgotten clan with ancient magic techniques, it would be very interesting. Additionally, their sense of humor could be different, making them the one who always brings a fresh perspective during interactions within the harem.
The OC can stand out by having a distinct personality. For example, if all the other harem members are bold and outgoing, the OC could be more reserved and intellectual. This contrast would make them interesting. Also, a unique skill or ability, like being able to communicate with spirits, would set them apart.
An OC could stand out by having a special skill or talent. Maybe the OC is an amazing cook and can make the most delicious food. In a world where battles and magic are common, this simple yet appealing talent could draw in characters from the series. They would be intrigued by this different side of the OC and gradually form a harem around them. It also gives a chance for some cute and comical interactions, like when the characters are all eagerly waiting for the OC's next meal.
One idea could be that the OC has a unique power that helps Rias and her harem in unexpected ways. For example, the OC might be able to sense danger before it arrives, allowing them to better prepare for battles against other factions. Another plot could involve the OC having a past connection to one of the members of Rias' harem, which creates some drama and tension as they navigate their new relationships within the harem. Maybe the OC is a long - lost relative or an old friend who has changed a great deal.
Giving the elf OC a distinct personality trait. Such as being extremely curious about human technology and constantly trying to incorporate it into their elven magic. This would create humorous and interesting situations as they interact with the other characters who are more used to traditional magic and may not understand their fascination with modern gadgets.
Power - building is a common theme. The OC usually starts off with some sort of special ability or knowledge and uses it to gain more power in the Highschool DxD universe. This power - building often attracts the attention of various female characters, leading to the formation of the harem.
You might want to check out 'The Lone Knight in Highschool DxD'. The OC in this story really dislikes the harem aspect and has some interesting interactions because of it.
Well, you might want to check out 'The Lone Warrior in Highschool DxD'. The OC in this one really dislikes the harem concept and it's got some interesting plot twists.
There's also 'Rising of the OC in DxD'. In this fanfiction, the OC is a reincarnated being. He uses his past - life knowledge to his advantage in the world of Highschool DxD. His harem includes characters from different factions, and the story delves into how he manages to keep them all together while facing various challenges from the supernatural world.
A Highschool DxD SI Gamer OC fanfiction can stand out by having a really unique SI OC design. For example, if the character has a very distinct backstory related to their gaming experience, like they were a pro - gamer in a previous life and now they have to use those skills in the Highschool DxD world. This makes the character more interesting and different from the regular characters in the series.
For the male OC, you can start by giving him a distinct personality trait. For example, if he's really shy, it can create interesting interactions with Rias who is often more confident. This shyness could be due to his insecurities about his newfound powers or his place in the supernatural world.