Rumble's chest reminds me of the 1970s Super Robot Gaiking, from the anime series Demon Dragon of the Heavens GAIKING It wouldn't be the first time that Transformers has been inspired by 1970s Super Robot though -- G1 Wheeljack's head bears a striking resemblance to Koutetsu Jeeg; and indeed the original Jeeg toys were made by Takara... and Takara designers have admitted that they it was Jeeg that inspired the Headmasters gimmick.