Based on the title, it seems the main characters are the two brothers. But without more of the story, we don't know their names or much about them other than they are brothers.
Well, without more context, it's difficult to say precisely. It could potentially be a story where two brothers have something to do with large spherical objects. Maybe they found big balls in an attic and it led to a discovery of some family secret or it could be a comical story about two brothers who are clumsy with large balls in a game or activity.
I'm not sure specifically as I haven't heard of this exact 'big brothers heavy balls story' before. It could be a very unique or local story. Maybe it's about a big brother who has some sort of adventure related to heavy balls, perhaps in a game or a strange situation.
The little sister is likely a young, curious girl. The big brothers could be teenagers or young adults. There might be a neighbor kid who is sometimes involved, perhaps a bit jealous of the relationship the little sister has with her big brothers and their 'big balls'. This neighbor kid could add some conflict or comical situations to the story, while the core relationship remains between the sister and her brothers.
I have no idea who told the 'big balls story' as you haven't given any context about it.
I'm not certain where you can find this story. It might be in some local libraries if it's a traditional or regional story. Check the children's or local folklore section.
I don't have enough details to know who the main characters are in this 'balls children's story'. It could be a group of kids like Tom, Jerry, and Lucy who are involved with the balls in some way.
Maybe it's about two best friends who love kicking balls together. They are the central characters in the story and their friendship grows stronger through their shared interest in ball - kicking activities.
Master Roshi is a key character. He is Goku's first martial arts teacher. He is old but very wise. Yamcha was one of the early antagonists - turned - allies. He is a desert bandit - turned - martial artist. And there's also Kami, the Guardian of the Earth. His connection to Piccolo and his role in the overall story are important aspects of the Dragon Balls anime story.
Based on the title, it seems that the main characters are Mom and Billy. Since the story has something to do with 'Billy's balls', Billy is clearly an important part, and Mom is also involved, perhaps in a relationship to Billy's situation regarding the balls.
Since I don't know the details of the 'buffer brothers story', I can only assume that the main characters are the Buffer brothers themselves.