Thunderblast is a female Transformer, and a member of an ancient race of Decepticons living on the Planet Earth. Prior to 2007, Thunderblast was the only female Decepticon ever to appear in a Transformers series in the United States. Thunderblast's vehicle mode is a speed-boat. She is armed with a quadruple-missile launcher that converts into a super-rocket launcher with use of a Cyber Key. She also has a 30. caliber Browning-style machine gun which mounts onto her boat deck in boat mode and which mounts onto the outside of her left leg.
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. This deceitful gambit doesn't always work, however, as some opponents do not give her the chance mis lead 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.
Thunderblast is obsessed with power. Not attaining it for herself, but rather, latching onto a "male" Transformer who has a lot of power. She follows the strongest Decepticon she can find, and the stronger he is, the more infatuated with him she is. As such, she is usually seen clinging to Galvatron (who certainly doesn't reciprocate). But as soon as the power structure shifts, so does the focus of her affections.
Though she's fickle and flighty (and greedy and selfish and opportunistic and vain and overconfident and...) she's not completely stupid. She knows how to use her wiles to get what she wants, and she's no slouch in combat, especially underwater. She knows Autobots are generally reluctant to shoot at a female and uses that to her advantage as long as she can...at least, long enough to give them a face full of missiles.
She seems to have something resembling an actual friendship with Lugnutz. And while she's generally disappointed if guys aren't fawning over her, she's found that she wants nothing to do with the geeky Shortround, who is infatuated with her. On the other end of the spectrum, she has quickly gained the undying hatred of the human girl Lori.
