* Toby: The protagonist, a young boy who struggles with the emotional and physical challenges of being a child of a single parent. He is deeply affected by his mother's struggles with her illness and the changes it brings to their lives.
* Mama: Toby's mother, who is battling a serious illness. She is a strong and loving woman who tries to keep a brave face for Toby, even when she is in pain and struggling with the uncertainty of her future.
* Dr. Mark: Toby's mother's doctor, who is kind and supportive. He tries to explain things to Toby in a way he can understand and help him cope with the difficult situation.
* Mrs. Katz: A kind and caring neighbor who helps Toby and his mother during their time of need. She provides a listening ear and practical support.
* Grandpa: Toby's grandfather, who lives far away but is a source of love and comfort for Toby.
There are also several supporting characters, including Toby's classmates, teachers, and other members of the community.
The book explores themes of illness, loss, grief, and the importance of family and friendship. It is a story of resilience and hope, showing how even in the face of difficult challenges, children can find strength and support from those around them.