IndigoErth already gave the perfect explanation.
They perfectly represent each individual character. It’s been pointed out here before that the colors make them instantly recognizable...literally instantly.
Drawing each one a little different is also good for setting apart but nothing is as impactful as those colors. Both from the audiences standpoint and character individuality since they are all the same basic design.
It’s why no other Sonic character is Blue. Each have their own palette. Colors matter in character design.
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