Kamon Nandaba,47, is Naota's father, a former pop culture journalist working as a freelance writer, with his own trashy tabloid: "Kamon-Mabase" (the title is a pun on "come-on mabase"). He makes the most references to pop culture: EVA, "Monkey-sensei" (referring to the creator of the series Lupin III), Hamtaro, Mobile Suit Gundam, and MTV to name a few. Kamon has taken a liking to Haruko, but she only wants to use him as an N.O. Portal.
In the fourth episode, Naota discovers that Haruko tried to use him but "his head didn't work" and that she had left a robot replacement to putter around the house. The real Kamon is found dead in a cabinet but is brought back to life by being hydrated in a small bathtub. Haruko's true intentions of coming to Mabase are revealed through her interactions with Kamon. After realizing that his head didn't open the N.O. portal, she discards him and returns to using Naota, saying "you're the only one who works".
Like the other adults in FLCL, Kamon is extremely immature, normally more so than the other adults. But he shows a surprising amount of seriousness and thoughtfulness at some points in the anime