For Boruto, he could develop from being a bit overconfident to a more mature and reliable ninja. Maybe through his interactions with Sumire, he learns to think more before acting. For Sumire, she could become more assertive. Working with Boruto, she might find the courage to voice her opinions more often and take on more leadership roles.
It's hard to say who the 'best' writers are as it's quite subjective. However, some writers who have a good reputation in Eyeshield 21 Kakei and Sena fanfiction might be those who really understand the characters well. They can capture the essence of Kakei's cool - headedness and Sena's shy yet determined nature.
Some popular themes in Eyeshield 21 Kakei and Sena fanfiction could be friendship development. Maybe Kakei helps Sena become even more confident on the football field. Another theme could be their teamwork. They might face a really tough opponent and have to rely on each other's unique skills to win. Also, there could be a theme of personal growth for both of them. Sena could learn from Kakei's calmness and Kakei could be inspired by Sena's determination.
Well, perhaps in the fanfic, there could be a plot where Boruto gets injured during a battle and Sumire has to take care of him. While taking care of him, she discovers a side of Boruto that he usually doesn't show. And Boruto, in his vulnerable state, starts to see Sumire in a new light. This could lead to a budding romance between them.
Writers often portray Boruto and Sumire's love in fanfiction as a kind of young, innocent love. They might write about how Boruto makes Sumire blush with his cheeky comments, or how Sumire's presence makes Boruto more focused on his tasks. It's all about the small, cute interactions that show the start of their feelings for each other.
Their relationship could develop through shared experiences. For example, if they both get involved in a dangerous fight against a common enemy, they'll start to trust each other more.
One idea could be that they go on a secret mission together. During the mission, they face various challenges that test their skills and teamwork. This could lead to a deeper understanding and bond between them.
In fanfiction, Boruto and Sumire could have a very sweet relationship. They might start as friends, gradually realizing their deeper feelings. For example, they could support each other during difficult ninja missions. Boruto's boldness and Sumire's intelligence would make them a great team, and that could be the foundation for their love to grow.
You can use graphic design software like Adobe Photoshop or online tools such as Canva. They have features and filters that can help you achieve the transformation.