They could also use their powers together in a coordinated way. For example, Breach could open a portal right behind an enemy, and Rex could use his Punk Busters to launch the enemy through the portal to a remote location. This would require them to communicate and trust each other, which could be a major part of their character development in the fanfiction.
Rex's powers could be used in a unique way if he has to combine his different nanite - based abilities in a new and unexpected manner. For instance, instead of just using his Smackhands to fight, he could use them to create a shield for Breach when she's in danger. This would show his adaptability and his growing concern for her safety.
One idea could be that Rex and Breach are forced to team up against a new, powerful EVO that threatens their mutual interests. Along the way, they start to understand each other's pasts and develop a grudging respect. For example, Rex could learn about Breach's difficult upbringing in the Nanite Collective and start to see her in a new light.
One possible fanfiction could be about Rex's adventures in a new, uncharted area where he discovers a strange new type of E.V.O. He has to use his powers in creative ways to deal with it and learn more about this new threat or ally.
For a Generator Rex vampire fanfiction, when creating characters, start with the vampires. Decide if they are traditional vampires or have some unique twist due to the world of Generator Rex. For example, they could have nanite - based powers instead of just the typical vampire abilities. Make their personalities distinct. Some could be brooding and mysterious, while others could be more outgoing and friendly despite their vampiric nature.
Fanfiction about Rex and Six could also involve a mission where they are sent undercover. They have to pretend to be ordinary people in a community that is on the verge of being overrun by E.V.O.s. They need to figure out how to stop the E.V.O.s without blowing their cover, and in the process, they learn more about each other's personalities outside of the battlefield.
For Rex, you could develop his character by showing his more vulnerable side when he's around Breach. Maybe he's usually the tough leader, but with Breach, he allows himself to show his doubts and fears. For Breach, show how he matures through his interactions with Rex. For example, he could become more responsible.
When writing Generator Rex fanfiction, it's important to stay true to the spirit of the original show while also adding your own creativity. For character development, think about how the events in your story will change the characters. Will Rex become more confident? Will his relationships with other characters evolve? Also, proofread your work carefully to avoid grammar and spelling mistakes. This will make your fanfiction more enjoyable for readers to read.
Definitely include Six. He's Rex's mentor and his combat skills and knowledge would be valuable in any crossover. If it's a crossover with a superhero team, he could offer strategic advice.
At first, they could be rivals. Ben might think Rex's nanites are too unpredictable, and Rex could see Ben as a bit of a show - off with his Omnitrix. But as they face common enemies, they start to respect each other. For example, when they're both captured by a powerful villain, they see how the other fights and starts to understand their strengths.
Another story could be set in a post - apocalyptic world where vampires have emerged as a result of some mutagenic event related to the nanites. Rex, being the only one with the ability to control his nanites, has to find a way to coexist with the vampires. He could encounter a vampire who was once a scientist and together they try to reverse the vampiric transformation in some people.
One important aspect of creating an engaging Generator Rex OC fanfiction is to focus on character relationships. Your OC can interact with the existing characters in different ways. They might start as rivals with Rex but gradually become friends. Also, describe the world vividly. Talk about the different EVOs, the Providence base, and the chaos in the cities. This will draw the readers in. Another tip is to add some mystery. Maybe your OC has a secret power that they don't fully understand yet.