Android Kikaider

(from ebookjapan):

The man with the bright red guitar on his back is a machine...?

Dr. Komyoji, an authority on robotics, developed the artificial human "Jiro" in memory of his late son. He was equipped with a special "conscience circuit (Geminy)"! However, due to a plot by a wealthy professor Gil, who was also a supporter of his research, the laboratory explodes and Dr. Hikaruji goes missing.

When the father sends a message to his daughter, Mitsuko, asking her to find "Jiro," who has disappeared with the circuits incomplete, what will happen to her?

Here comes the Ishinomori hero, struggling with the meaning of his own existence!

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Links to ANN:
Live Action - Tokusatsu
Live Action
Live Action (sequel)
Live Action (spinoff)
Live Action Movie

Anime
Anime
OAV (sequel)
Kikaider vs. Inazuman (OAV)

Manga
Manga
Manga (remake)
Manga (alternate ending)