Higeoyaji

Higeoyaji is a recurring character in the Astro Boy series. He appears in every single iteration of Astro Boy.

Manga
Higeoyaji is both a teacher and Astro Boys teacher. He prefers the old technology-free style of living.

1963
Higeoyaji is a "Fuddy-Duddy" as he prefers the old technology-free style of living. He's also a detective.

1980
Higeoyaji is Astro Boys teacher. He is called Daddy Walrus in this iteration.

2003
Higeoyaji is a Detective that works for no pay. Mainly finding lost animals.

2009
Higeoyaji is shown multiple times as a background character in the movie.

Jetter Mars
Higeoyaji also appears in Jetter Mars as a Teacher and a detective.

Episodes appeared in
2003 Series

Episode 27. Old Dog, New Tricks

Episode 29. The Case of the Phantom Fowl

Episode 34. Shape Shifter

Episode 35. Phoenix (or Firebird)