Huck is a 8-9 year old boy who has no parents. The book never mentions his mother and his father is a drunk who left the town many years ago. Huck just lives on the streets. As it says in the book, Tom "...was under strict orders not to play with him. So he played with him whenever possible."
Huck and Tom are best friends and go on many adventures together. Huck is "feared" by all the kids' mothers because they think he is a bad influence because he drinks and smokes. He saves the Widow Douglas from being mutilated, which shows that he has a very good heart, despite his rough appearance.