Harrison Wells isn't part of the comic world. He's unique to the TV adaptation. The show introduced him as a new element to the story, separate from the comic source material.
There could be a Zerg leader - type character that has the intelligence to communicate with humans. This character might be trying to find a new home for the Zerg on Earth without completely destroying the planet. It would be a complex character, having to balance the needs of its own race with the potential harm to Earth and its inhabitants.
One interesting plot could be the Zerg adapting to Earth's unique environments. Maybe they find some plants or substances on Earth that either help or hinder their growth and evolution.
One common theme is culture shock. The OC from Earth is suddenly in a very different world, like Remnant in RWBY. They have to deal with new customs, technology, and ways of fighting. Another theme is the idea of bringing something new. The OC often has skills or knowledge from Earth that can be useful or cause trouble in RWBY's world.
Harrison Bergeron is the protagonist in the story. He is a young man who has extraordinary abilities, both in terms of physical strength and intelligence. He rebels against the society's forced equality by breaking free of his handicaps.
A RWBY OC from Earth can stand out by having a unique backstory. For instance, if they come from a war - torn area on Earth, they might have a different view on conflict compared to the characters in Remnant. This could lead to interesting interactions and decisions in the story.
Another theme is adventure. Many fanfictions send Harrison on new and exciting adventures, whether it's exploring unknown parts of the wizarding world or facing new dark forces. It keeps the spirit of the original series alive.
Another theme is the exploration of their relationship. Many fanfictions focus on how they overcome obstacles in their relationship, whether it's misunderstandings or external threats. It's all about deepening their bond.