Her tech spec indicates that she frequently takes advantage of her looks, counting on the fact that Autobots won't blast her on the grounds that she's female, using her charms to beguile them then destroy them. She has a loose affiliation with Sideways. Despite her appearance, she is actually one of the ancient Decepticons freed by Starscream in his quest for power. In ancient times she posed as a siren, luring human sailors to their deaths with Cybertronian songs. However, her Takara bio indicates she is not without ambition. It is known that the Decepticon Shortround is infatuated with Thunderblast. Thunderblast is also a chronic side switcher. During the final battle between Galvatron and Starscream, she is heard to think that she would support whoever won.
She was later approached by Starscream (now enlarged and enhanced by the power of the Cyber Keys) and was given the choice of stealing the Omega Lock for him or being destroyed. Thunderblast chose the former, but betrayed him when she led Starscream to Megatron, refusing to steal it. The Autobots subsequently drove off all involved.
Subsequently Thunderblast teamed up with Scourge to search for the Jungle Planet Key, battling Wing Saber. However Thunderblast's dedication would prove to be not so enduring, after Megatron (now Galvatron) transformed Thunderblast and the other Decepticons into gigantic warriors using the power of the stolen Omega Lock and Cyber Planet Keys. Appalled at how they were used as pawns while Galvatron went on to destabilize the Black Hole in order to wipe out a large portion of the galaxy, she and the remaining Decepticons abandoned him.
When the Autobots attempted to use a gigantic rocket to move the Jungle Planet back into its orbit, Galvatron attacked and damaged the rocket. The Jungle Planet threatened to crash into Cybertron. Surprisingly Thunderblast and the other Decepticons helped to right the booster, helping to save Cybertron.
It seemed Thunderblast and the others would remain in the Autobots' company. However, Thunderblast and her comrades found themselves dissatisfied with playing the role of a "hero", and after abducting Thundercracker, departed to search the galaxy for a new leader. The hapless group didn't get far: the credits montage that closed the series showed they had crashed on what appeared to be Mars.
His Hasbro bio indicated that he doesn't really bear Sky Lynx any ill-will and even respects him as a worthy adversary - it's just that the challenge offered is too great to pass up, with both Mini-Cons treating it as a sort of game, little caring who won. He even wishes that things were different so that they might be friends
Unlike most previously released Mini-Cons, Thunderblast and his team are full members of the Autobot faction.