Saburo is one of the characters appearing on the original manga. His father was intelligent and was a scholar. He has a younger brother. His favourite food was Kasiwamochi.
He was along with Gian, Suneo & Nobita. He boasted to the group that his father is full of brains. When Nobita said that his father can smash a rock, he didn't believe him. But when Nobita's dad really smashed the rock he was amazed and praised Nobita for having such an awesome dad.
I Want to Borrow the Cat Hand
In the manga, he reveals his family name.