Grary could start off as a shy character but through his interactions with the outgoing SpongBob, he becomes more confident. For example, at first, he might be afraid to speak up in front of the other sea creatures, but as he spends time with SpongBob, he learns to be more assertive.
One idea could be that Grary, a new character in Bikini Bottom, becomes friends with SpongBob and they go on a treasure - hunting adventure. They might discover a long - lost underwater city filled with strange creatures and hidden secrets.
Joey could start as a timid trainer and become more confident as he bonds with Rattata. Rattata, on the other hand, might start off as a wild and skittish Pokémon but become more loyal to Joey over time.
Both characters could develop their relationship in terms of trust. Naruto, who is generally trusting, could face some challenges that make him question Karin at first. Karin, on the other hand, could learn to be more open with Naruto. Their journey towards building a full - fledged trust could be the central theme of the fanfiction, with various events and conflicts testing and strengthening their bond.
Karai could start off as a cold and calculating character, but as she spends time with April, she might become more empathetic. For example, seeing April's kindness towards others could make Karai question her own actions.
Alucard could start to see Anderson not just as an enemy but as a worthy adversary with a sense of honor. This might make him less bloodthirsty towards Anderson specifically. For Anderson, he might come to understand that Alucard is not just a mindless monster but has his own reasons and a complex past.
One possible character development for Loki is that he becomes more empathetic. Hulk's simple and straightforward emotions could rub off on Loki. He might start to feel genuine remorse for his past misdeeds. On Hulk's part, he could become more diplomatic. Working with Loki, who is a master of manipulation and politics in a way, Hulk could learn to use words as well as his fists to solve problems in the fanfiction.
Pikachu might become more empathetic. Usually, Pikachu is known for his energy and courage. But in a fanfic with Buneary, he could learn to understand Buneary's more delicate feelings. For instance, if Buneary is sad because she misses her family, Pikachu could learn to comfort her in his own way, which would make him more in - touch with emotions.
For Hanamiya, he could start as a very antagonistic character, but as he spends more time with Kuroko, he might become more empathetic. For example, he could learn to understand the importance of teamwork in a more positive sense, rather than just using his teammates as tools to win.
Wolverine could develop more patience. Usually a lone wolf, being around Nightcrawler's more upbeat and spiritual nature might force him to slow down and think more. For example, Nightcrawler's teleportation ability might make Wolverine rely on a different kind of strategy in combat rather than just his brute force.
In a Broly x Gohan fanfiction, Gohan could develop a new understanding of power. Instead of just relying on his academic knowledge and some of his traditional training, he could learn from Broly that power can also be about pure instinct. Meanwhile, Broly could develop his mental faculties. Gohan might introduce Broly to things like meditation or mental focus exercises. As a result, Broly becomes less of a mindless brute when it comes to fighting and more of a thinking fighter, which would be a significant character development for him.