Multiplayer aspects can be added too. Imagine the OC starts an in - universe gaming club where characters from different species in Highschool Dxd can compete against each other in various games. This could lead to some interesting rivalries and friendships, like a devil and an angel teaming up to win a game against a group of fallen angels.
Another way is to introduce gaming mechanics like loot drops. When the OC participates in battles or events in the Highschool Dxd world, they might get random loot drops which could be anything from magical weapons to rare potions. These loot drops could then be used to upgrade their abilities or traded with other characters in the story.
Well, you could have the OC Archangel fall in love with one of the human characters. Maybe it starts as a simple attraction because the human has a kind heart or a strong will. For example, if the human is always standing up for the weak in the school, the OC Archangel might be drawn to that. Then, as they spend more time together, their feelings grow deeper.
The OC's backstory as a gamer is crucial. Maybe they were a bullied gamer in the human world but in the Highschool DxD world, they find a new sense of purpose and power. Their journey from being an underdog gamer to a powerful figure in the DxD world can be very memorable. Also, give them some quirks like always quoting game lines at inappropriate times which adds humor and memorability.
It could incorporate RPG elements like leveling up. The gamer character could help Fairy Tail members level up their magic skills faster. For example, by doing special quests or battles.
You can start by making martial arts a part of the OC's backstory. Maybe they grew up in a dojo or were trained by a martial arts master. This gives a reason for their skills.
They often use game - like interfaces. For instance, a character might see a virtual HUD (Heads - Up Display) that shows their health, ammo, or the number of zombies nearby. This gives a very gamer - centric feel to the story.
The OC gamer could fit in by bringing a fresh perspective. For example, he might introduce new technologies or ways of thinking based on his gaming experiences. With Raynare, he could start by trying to understand her motives. Maybe he offers her a deal where she helps him navigate the world in exchange for something she wants. This way, he can gradually build a relationship with her and find his place in the 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.
Often through character design. In some fanfics, a character from Highschool DxD might be given an appearance or ability inspired by a Warhammer character. For example, a devil in DxD could have armor similar to a Space Marine's.
In a Highschool DxD OC and Sharingan fanfiction, you can incorporate the Sharingan powers in the story by making it a source of mystery and envy among the other characters. The OC could use the Sharingan's ability to enter the minds of others (a more advanced form) to gather information about the devils' plans. This would make the OC a valuable asset to their group. Also, the Sharingan could have a connection to some ancient prophecy in the Highschool DxD world, which would add more depth to the story and make the powers more significant in the overall plot.
Give the OC a distinct gaming style. For example, if they are a stealth - based gamer in the real world, they could transfer that into the DxD world by having the ability to use magic to become invisible or move silently. This would make them stand out.