Eitarō Kite is the father of Eiichi Kite (Kiteretsu), consistently championing his son's inventive spirit and scientific experiments. He stands in contrast to Kiteretsu's mother, Michiko Kite, who voices greater concern over their son prioritizing academic studies. Eitarō's supportive nature positions him as an encouraging figure for Kiteretsu's creations inspired by the ancestral encyclopedia.

Within the family structure, Eitarō balances parental responsibilities with Michiko. While Michiko frequently worries Kiteretsu's inventions distract from schoolwork, Eitarō maintains a more accepting attitude toward these mechanical pursuits. This dynamic often leads Kiteretsu to attempt hiding his inventions from his mother, finding understanding instead with his father.