An old friend of Insarn's from high school, Jealousto was in love with the scientist and willing to do anything to receive her love. However, upon learning that she is in love with Kyousuke Jinnai (Red Racer), whom he was sent to capture, Jealousto goes all out to destroy the human with his jealousy-fueled fire attacks, which include Fiery Jealousy Power and Jealousy Flame Slash. But after being suddenly enlarged, with Kyousuke helping him win Insarn's love, Jealousto is defeated by Shinken GokaiOh. Though he survives the fight, Jealousto loses all respect from Insarn as she requests him to be launched into deep space with the garbage.