what is the most distinct difference between the main character jim and all of the others in the sunday-school books

This story is referring to Mark Twain's short story ''The Story Of The Bad Little Boy'' written in 1875.

That ''Bad Little Boy'' from the story is called Jim. Most of the bad boys were called with the same name in Sunday books.

They had mothers that taught them everything, sang them lullabies, kissed them for a good night and they were sad and sick. This boy Jim was having a mother that did not teach him to sing his prayers and she was different from the other mothers in Sunday School books. She wasn't anxious about her child, she did not kiss him for a good night and she spanked him. She was not a sample of a good mother like in other books so here the most important difference is mother.