Blue Knight

The Blue Knight is an ally of Astro Boy that hates humans because of the way he was treated by humans when he was small and vowed for revenge. Found by Shadow, he was changed into a battle bot. He has a sword as his weapon.

He only appeared in the 2003 series.

Personality
The blue knight can often be careless, and never thinks before acting. It took Astro a long time for him to realise humans are not all bad.

Interactions with other characters
Astro

Grudon, his original cruel human master

Shadow, who found him and rebuilt him

Robotonia
Main article: Robotonia

Robotonia is a robot city situated at the south pole that the Blue Knight built for robots. It declared war on humans shortly after.