These are the unseen characters.
“Jinchu Hattori is the father of Kanzo Hattori and Shinzou. He is never seen in real life, but is...Jinchu Hattori
“This is a list of Ninja Hattori minor characters. The school students are classmates of Kenichi...List of Ninja Hattori minor characters
“Kanzo Hattori and Shinzou's Mum lives in Ega - town. Despite being very distant from them, she...Hattori and Shinzou's mum
“Mr. Kawai is Yumeko's father. He does not appear in the series, but he is mentioned in a couple...Mr. Kawai