The OC's personality can be very distinct. They could be extremely humorous and use that to lighten the mood during tense situations. This would be different from the more serious natures of some of the Justice League members like Batman. Also, they could have a strong moral code that is not exactly the same as the League's, which would lead to interesting discussions and interactions.
The OC might have a different cultural background. If they are from a far - off planet or a hidden society on Earth, they would bring in new customs, values, and ways of doing things. This would not only make them stand out but also add new elements to the Justice League's dynamic.
One common theme is the outsider - insider dynamic. The OC is usually an outsider who enters the world of the Justice League and forms relationships. Another theme is the exploration of different powers and how they interact 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.
Maybe the OC has some special power that the Justice League needs to defeat an upcoming threat. As the OC trains with the team, romantic tensions start to rise. Wonder Woman might see the OC as a worthy partner, both in battle and in life. The Flash could be drawn to the OC's carefree and adventurous spirit. Green Lantern might find the OC's ability to adapt to new situations very appealing.
I think Flash himself would be really interested. After all, it's about him. He'd be curious to see how the writer of the fanfiction portrays his character, his powers, and his relationships with the other members of the Justice League.
A unique relationship could be based on mutual respect. The OC might be from a different dimension where stone magic is more prevalent. When they arrive in the Justice League's world, they are initially met with suspicion. But as they prove their worth by using their stone powers to save a member, like Aquaman from a stone - trapping villain, they earn the respect of the whole team. And in return, they respect the League's values and leadership. This could lead to a deep - seated friendship and cooperation within the team.
One common theme is the 'fish - out - of - water' story, like when an OC from a normal life suddenly gets thrown into the world of the Justice League. It creates a lot of opportunities for character growth and comedic moments as they struggle to understand the superhero world.
One great 'OC Justice League Fanfiction' is 'The New Hero Among Them'. It's about an original character with unique powers who joins the Justice League. The story focuses on how the OC adapts to the big - league environment and forms relationships with the well - known heroes. It has exciting action scenes where the OC's powers are put to good use against classic villains.
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.
An Immortal OC could be a mentor figure. Since they've been around for so long, they can offer unique insights and wisdom to the younger, less - experienced members of the Justice League.
One common theme is the outsider - turned - insider. The male oc is usually not originally part of the Justice League and has to find his place. Another theme is the development of multiple romantic relationships, which often involve different personalities within the female members of the Justice League.