•
Zenon Wójcik (called
Zenek) is the main and title character of the book. After the death of his mother he lived alone in
Wrocław with an alcoholic father. He had had enough of this life, so he decided to flee to his uncle. While trying to escape he hurt his leg with a piece of glass and stopped on an island near Olszyny. There he found the four friends. Zenek falls in love with Urszula Zalewska. •
Urszula Zalewska (called
Ula) is a very quiet and a shy girl. She doesn't like to talk about her feelings. She was the first to notice that Zenek is wounded, and that the group of friends should help him. Ula lives with her aunts in
Warsaw. Her father is a doctor. Like Zenek she has no mother. •
Juliusz Miler (called
Julek) is a younger cousin of Marian. He is very energetic and dynamic. He does not like to play with girls, unless the 'Pip'. Julek loves the fact that Zenek saved the child and treats him as the greatest hero and his authority, although at first he wanted him as a first strike. •
Pestka Ubyszówna (called
Pip) is energetic and likes to impress Zenek by doing things, such as swimming. Pip is the best friend of Ula, although sometimes both fight. Zenek admires her for her courage. •
Marian Pietrzyk is the oldest of the entire group. He is fully in the role of leader and guide. He is the older cousin of Julek. Zenek does not like the group, but Marian makes him stay. When the holidays come along, he decides to visit his grandparents in Olszyny with Julek. •
Danube (
Dunaj) is an unknown dog, which likes Ula. At the beginning of the book he is wild, but then the children with the help of Zenek embrace the animal. When Victor later on in the book throws a stone at the Danube, the dog becomes wild again. ==References==