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Elder brother to Reo Shishiou, Raiga is Guy Shishiou's uncle and father of Renais Kerdif-Shishiou and Shigeru Akamatsu, grandfather to Sakura. Inventor of the Dimension Pliers, as well as the Solitary Wave Riser and Disc X, which was inspired by observation of Betterman Lamia's Psycho Voice attack in Nebula form. He is also the one who upgraded and altered Renais's cyborg components using a portable GS-Generator, saving her life at the cost of needing a cooling coat to go out among normal people. Raiga is also the creator of the Linker Gel synthesizer known as the Grianoid, which would later see use on GaoGaiGo as well as on traditional Neuronoids.
Unlike his brother, Raiga dresses in a ridiculously gaudy outfit, including a yellow jumpsuit, green cape and stylized sunglasses. He rides a rocket-propelled skateboard (the counterpart to Leo's rocket skates) and displays another rocket hidden in his right glove during a comical battle with Leo.
After Leo's death, Raiga would go on to become the chief science officer of the Gutsy Galaxy Guard. He was later transferred back to NASA prior to the start of King of Braves GaoGaiGar FINAL, but would return in time to join GGG in their trip to the Trinary Solar System. Raiga's contribution during this trip was relatively minor - he altered the connector for the Goldion Crusher in such a way that Genesic GaoGaiGar could use it properly.