Dr. Tenma's son. Toby was then replaced by Astro Boy after specific events. There were a few things that lead to Toby's cease of existence. It depended on what version of Astro Boy you watched.

Spoiler

* In the 2003 version Toby ran away from home. * In the Astro Boy 2009 movie, he was killed by a robot known as the Peacekeeper. * In the Astro Boy manga series, and 1980's he died in a car crash. ·

Toby is usually very adventurous and polite, and is very brave. Unfortunately, in the 1980's show, and the 2009 movie, his curiosity and impatience are fatal to him. He isn't too courageous unlike his robot counterpart, Astro Boy.