Chitron 6

Chitron 6 was a character in the show who is a robot that assisted Prince Astor and Princess Verbina, but was destroyed by Aku after attempting to persuade him not to enslave the Prince and Princess. He was voiced by Tom Kenny. He only appears in Episode XLVII: Jack and the Flying Prince and Princess.

His destruction was presumably undone after the past Aku's destruction.

Trivia

 * Chitron 6 somewhat resembles the protocol droid C-3PO from the Star Wars franchise.
 * Tom Kenny, who voiced Chitron 6, would go on to voice another robot character, Scaramouche, in Season 5.