For Makarov, his leadership skills could be further explored. Maybe in the fanfiction, he has to lead in a situation that is very different from what he's used to, and this could change him. As for Mirajane, her kind-hearted nature could be developed by having her show more compassion to Makarov in difficult times.
Some popular themes could be adventure. Maybe they go on a quest together in the fanfiction. Another theme might be friendship development, like how they start as acquaintances and grow closer.
For Pikachu, you could develop his curious side more. Maybe he's always eager to explore new areas in the fanfiction, which sometimes gets him into trouble. Sylveon could be shown as the more cautious one, using its ribbons to hold Pikachu back when he's about to rush into danger.
Lucy's personality can be developed by putting her in different scenarios at Happy Lemon. Say she's a bit of a perfectionist. At Happy Lemon, she might notice that the presentation of the drinks isn't always perfect. Instead of just complaining, she could start helping the staff to improve it, which would make her more understanding and less critical. As for the Happy Lemon characters, like the employees, if they start off as a bit lazy, they could be inspired by Lucy's enthusiasm to become more hard - working and take pride in their work. You can also have Lucy introduce new ideas to the Happy Lemon crew, which would make them more open - minded over time.
For Bumblebee, his usually brave and somewhat impulsive nature can be developed further. In the fanfiction, he could face situations where his impulsiveness gets him into trouble, and he has to learn to be more cautious. Smokescreen, on the other hand, who is often eager and a bit naive, could be put in situations that force him to become more worldly - wise. For example, he might encounter deception and learn to be more discerning.
Naruto's loyalty and his belief in friendship can be deepened in the fanfic. When he meets Rukia, he could start to understand different types of loyalty, like Rukia's loyalty to Soul Society. Meanwhile, Rukia's sense of justice might be challenged and broadened by Naruto's more free - spirited approach to right and wrong. This interaction would lead to the development of both characters in new and interesting ways. Naruto might also start to show a more mature side as he realizes the weight of Rukia's responsibilities, and Rukia could become more in touch with her own emotions as she experiences Naruto's passion.
To develop Artemis' personality, you can explore her past more. Maybe she has some family issues that she shares with Superboy. This makes her more relatable. Superboy's personality can be developed by showing his growth. At the start, he might be a bit brash, but as he spends time with Artemis, he becomes more patient and understanding. You could also show how their relationship affects their relationships with other team members. For example, they might start to work better as a team because of their new - found connection.
Ash could be shown as more empathetic towards Growlithe. His usual determination to be a great trainer could be combined with a newfound protectiveness over Growlithe. For Growlithe, it could be developed as being more curious about Ash's world and trying to adapt to human ways while still maintaining its Pokémon instincts.
To develop Flash, you can focus on his emotional side. For example, show how his super - speed sometimes makes him feel isolated from normal people. When he's with Hawkgirl, he could start to open up more and become more in touch with his emotions. For Hawkgirl, explore her past more deeply. Maybe she has some unresolved issues from her previous lives. As they interact in the fanfiction, these past issues can come to the surface and Flash can help her deal with them, which in turn develops their relationship.
Through their reactions to the new body. A character who is usually calm might become more agitated if they swap into a body with a lot of pent - up energy. This shows a new side of their personality.
For Optimus, his sense of duty and leadership can be further explored. In a fanfiction, we can show how he balances his leadership role with his personal relationships, like with Bumblebee. For example, he might struggle between making the tough decisions for the group and protecting Bumblebee from harm.