Why Blue is so important color in Super Sentai (beside Red)

How about the color white the reason is, as white often used to represent coolness and simplicity. The color of snow is white and snow is quite cold. What do you guys think, about the color white as the replacement for blue.
 
How about the color white the reason is, as white often used to represent coolness and simplicity. The color of snow is white and snow is quite cold. What do you guys think, about the color white as the replacement for blue.

White is also extremely hot. White-hot is the extreme for heat. White is more of the presence of all colors or a clean slate (purity), as opposed to coolness.
 
they would never replace blue since red and blue are trademark colors of sentai unlike yellow which only hadn't appear in at least three sentais. as for what a blue senshi represents it depends on the seasons, sometimes the blue is second in command and something the blue is third, so really there is no real answer to a blue's purpose but that doesn't mean they shouldn't belong.
 

Yellow is still pretty much a constant in the franchise and a "trademark colour." There's a reason why teams of three are Red/Blue/Yellow and why there was so much commentary over the lack of a Yellow in Kyoryuger - reportedly, Blue's actor was even asked about it in a TV interview. I think the reason why Yellow isn't as important as Blue is that it's associated with female Rangers now, and before that, several male Yellows were comic figures.

Blue has replaced Black as the usual choice for team second in command, maybe because there's always a Blue on the team while Blacks alternate with Greens? In the 2000s, a lot of male Blues were the cool, aloof foil to Red and now they seem to have been turned into the smart older guy who may have a lot of comic moments but is responsible and cares for others (GoseiBlue, Blue Buster, KyoryuBlue even though Black IS the second in command of Kyoryuger ...)
 
True, although Nossan really isn't smart as Blue Buster, GoseiBlue, and GoOnBlue are. Though he does share the bruiser stereotype with Ryuji.
 
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