Originally Posted by GoseiWonder
Did Gokaiger ever explain that? Or was that just "Green and black are... Um... Hey kids, look at the badass pirates!
Actually, there whole reason Green could become Black Rangers was because of the counterpart set up. Green would go to Green, but if there wasn't a Green, he'd be Black.
Himitsu Sentai Goranger (Each Number Represents the # on the helmet):
GokaiRed- AkaRanger (1)
GokaiBlue- AoRanger (2)
GokaiYellow- KiRanger (3)
GokaiGreen- MidoRanger (5)
GokaiPink- MomoRanger (4)
And when there wasn't a color counterpart (or if the ranger with the same color was actually a 6th ranger,) they went with number placement.
Ninpuu Sentai Hurricaneger
GokaiGreen- Kabuto Raiger
GokaiPink- Kuwaga Raiger
Bakuryuu Sentai Abaranger-
GokaiSilver- AbareKiller (due to being the "6th")
However, each one of them could turn into whatever ranger they wanted.