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.
Pikachu's loyalty can be a big part of his personality development. When Sylveon is in trouble, Pikachu could be the first to jump in and defend it. Sylveon, on the other hand, can show its gentle and nurturing side by taking care of Pikachu when he's hurt. This can be shown through things like using its ribbons to bandage Pikachu's wounds.
To develop their personalities, you can also give them little quirks. For example, Pikachu could have a habit of always zapping things when he's excited. Sylveon could have a love for shiny objects and be distracted by them easily. As the story progresses, these quirks can either be endearing or cause some comical situations. And through these experiences, they can grow and change. For instance, Pikachu might learn to control his excitement better, and Sylveon could become more focused on important tasks instead of being distracted by shiny things all the time.
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.
Another way to develop the male Sylveon is through its backstory. Perhaps it was abandoned by its previous trainer because it was a male Sylveon and not what they expected. This experience could make it more cautious at first when it comes to new trainers or situations. But as the story progresses, it learns to trust again and becomes a stronger and more confident Pokémon. This backstory can add depth to the character and make it more relatable.
They could also have common goals. Let's say they both want to build a really cool treehouse in a particular forest area. They would need to gather materials, plan the structure, and work together. During this process, they'll learn more about each other's strengths and weaknesses. Emolga could use its flying ability to carry light materials to the treehouse site, while Pikachu could use its small size to fit into tight spaces to set up the interior. This kind of cooperation will deepen their bond.
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.
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.
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.
One idea could be that Sylveon and Pikachu go on an adventure in a magical forest together. Along the way, they discover a hidden glade filled with rare berries. As they share the berries, their friendship deepens in a really cute way.
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.