They could also develop their abilities in response to dangerous situations. Let's say they are being chased by vampire hunters. In order to escape, they unconsciously tap into a new level of their powers. Zack might discover he can turn invisible for a short time when he's really scared, and this discovery then leads him to practice and control this new ability better in the future.
Another way is through interaction with other vampires. If there are more experienced vampires in the fanfiction, they could teach Zack and Cody how to use their powers. Maybe an older vampire shows Cody how to use his mind - reading ability by guiding him through different mental exercises.
One interesting story could be about Zack and Cody becoming vampires and having to hide their new identities in the hotel. They might struggle with their new cravings while also trying to keep up their normal hotel - living shenanigans.
In Twilight, vampires have superhuman strength, speed, and enhanced senses. They can run extremely fast and their eyes change color based on their diet. In Vampire Knight, vampires also have great strength and speed, but they also have unique abilities like some can control ice or fire. So, the abilities are somewhat similar in terms of basic physical enhancements but different in the unique powers.
The kidnapped character often starts off as terrified and desperate to escape. As the story progresses, they may start to understand the vampire's motives and become more empathetic. For the vampire, they might initially be cold and controlling but gradually develop feelings for the kidnapped character, softening their nature. For example, they could start to show remorse for the kidnapping.
Sookie often develops by becoming more confident in her abilities. In many fanfictions, she starts off a bit naive but as she spends more time with Eric, she learns about the vampire world and becomes more assertive. Eric, on the other hand, can develop a softer side. His interactions with Sookie make him more in touch with his emotions.
The martial arts skills of Ranma could be combined with the supernatural abilities of the Rosario Vampire characters. For example, Ranma's quick and powerful punches and kicks could be enhanced by Moka's vampire strength. Or, Ranma could use his agility to dodge attacks while using the magic of the Rosario Vampire characters to counter - attack. Another way their abilities could combine is through teamwork. The nekos from Rosario Vampire could use their speed and stealth to set up attacks for Ranma, while Ranma could use his combat experience to protect the more vulnerable characters from Rosario Vampire.
In many fanfictions, Silas's character may develop from being a purely power - hungry villain. He might start to show more vulnerability when it comes to Amara. For example, he could sacrifice some of his power - seeking plans just to keep her safe.
Often in fanfiction, their character development is intertwined. As they interact more, they both change. Rebekah might become more empathetic due to Elena's influence, and Elena could become more street - smart in the ways of the vampire world with Rebekah's guidance. Their relationship could shift from one of animosity to one of mutual respect and friendship, which is a significant development for both characters in the Vampire Diaries fanfiction universe.
In some fanfictions, Stefan's character might become more assertive in his relationship with Katherine. Instead of being the one always trying to resist her charm, he starts to take charge and make decisions that affect both of them.
For Tinkerbell, emphasize her kind - hearted and curious nature. She should be determined to save her sister. As for the vampire twin sister, give her a conflicted personality. She's a vampire but still has some of the fairy traits like a love for nature, but it's overshadowed by her new thirst. You can show her internal struggle through her actions and dialogues.
Oz's character might develop by becoming more in control of his werewolf side. In fanfiction, he could learn new techniques from Tara's magic to manage his transformations. For example, he might be able to use a spell to transform only when he wants to. Tara, on the other hand, could become more confident in her magic abilities. She might start using her powers more openly and aggressively, especially when it comes to protecting Oz and Buffy.