One possible theme could be frustration. If the boy is angry, he might be frustrated with his circumstances, like not getting what he wants or facing difficulties he can't easily overcome.
Another theme could be injustice. If he's been treated unfairly, either at home, school or in society, his anger could be a reaction to that sense of injustice. For instance, if he was wrongly accused of something he didn't do at school, his anger might stem from the unjust situation. Also, the theme of growing pains could be relevant. As a boy grows up, he may face various challenges that he doesn't know how to handle, and anger could be one of the emotions that come out during this process.
One possible theme could be the struggle against adversity. Since he's angry, it might be due to facing tough situations like discrimination or abuse.
Friendship might be a theme. If the boy interacts with sea creatures or other people in the context of the ocean, it could show how he forms bonds and relationships, whether it's with a dolphin he befriends or a fellow fisherman he meets. Another theme could be self - discovery. As he spends time in the ocean environment, he might learn more about himself, his capabilities, and his place in the world.
One possible theme could be survival. If the boy is lost, he has to find ways to stay alive, like finding food and shelter.
One possible theme could be perseverance. The wonder boy might have had to keep going in the face of difficulties.
One possible theme could be perseverance. If the boy in the story faced tough situations, his ability to keep going would be a key theme.
One possible theme could be isolation. If a boy is in the wall, he is likely cut off from the outside world, which can symbolize feelings of loneliness and separation.
One possible theme could be growth. If it's about a boy's journey, he might grow and learn important lessons.
One possible theme could be financial gain. The crypto boy might be on a quest to make money through trading or investing in cryptocurrencies.
One possible theme could be friendship. The boy might form deep bonds with other characters in the story, and these friendships help him through tough times.
Another theme might be growth. Through their interactions with the birds, the boy or boys could grow in understanding, compassion, and a sense of responsibility. For example, if they rescue a bird, they learn about taking care of another living being. This could be a step in their personal growth journey.