Bakuretsu Muteki Bangai-O (1999)

A group of space pirates known as the Cosmo Gang is concocting an evil scheme, which involves smuggling rare fruits and using them for their own foul purposes. Two young mecha pilots, Riki and his sister Mami, board a giant mecha called Bangai-O, in order to confront the pirates in battle and foil their villainous plans.