His abilities are still named after the namesake of his vehicle and his own moniker, however.
He isn't given some
tiger themed attacks or
dolphin themed attacks, for example. He throws fiery punches in the shape of a
falcon.
"Blue" is also not an element, so your counterpoint makes little sense.
Aside from that, there are
numerous correlations with birds and fire (the legendary phoenix that is reborn from its own ashes?), hence why the term "firebird" exists (which
also coincidentally is linked to a type of classic sports car, which could
come in blue) as well as the fact that
blue flames are scientifically the flames that burn the hottest.
Literally nothing about Samurai Goroh, pilot of the Fire Stingray, using watery dragon-themed attacks makes any sense.