There are several popular OCs. One might be a character named Elara. She has the ability to harness the power of lightning, which was bestowed upon her by the god Zeus in the fanfiction. Her backstory of being an orphan and rising to become a powerful adventurer makes her a fan favorite.
Another aspect is the world - building. In 'danmachi oc god fanfiction', the author might expand on the existing world of DanMachi. They could introduce new areas of the dungeon that are only accessible through the OC's special relationship with the god. This can add a whole new layer of mystery and adventure to the story.
Maybe an OC that is an artificial being created by a powerful wizard long ago. The OC wakes up in the present day of the Danmachi world and has to learn about the new society and dungeon while also dealing with the fact that they are different from everyone else. They could form unique relationships with the existing characters as they try to find their place.
First, focus on their backstory. A detailed and unique backstory can make the OC stand out. For example, if your OC was once a slave who escaped and found freedom in the dungeon - exploring and adventuring as a way to never be enslaved again. Second, give them a distinct personality trait. It could be something like being extremely superstitious, which would lead to funny or tense situations in the dungeon. Third, their appearance should also be memorable. Maybe they have a unique hair color or a strange mark on their body that has a special meaning.
One idea could be to create an original character (OC) who has a unique power that catches the attention of a goddess. For example, an OC with the ability to manipulate time on a small scale. The story could revolve around how this power affects the relationship between the OC and the goddess, and how they team up to face challenges in the danmachi world. Maybe they have to deal with a powerful monster that is immune to normal attacks, but the OC's time - manipulation power gives them an edge in battle.
For character development in a 'danmachi oc cum goddess fanfic', think about the character's arc. The OC might start as a novice adventurer with little confidence but gradually gain more self - assurance as they gain experience and the support of the goddess. Consider their moral compass too. Do they have a strict code of ethics, or are they more of a morally gray character? This will affect their decisions in the story. As for the goddess, explore her backstory in relation to the other gods and goddesses in the danmachi universe. Maybe she has a rivalry with another goddess, and this affects how she treats the OC. By understanding these elements, you can develop complex and engaging characters for your fanfic.