Original Purple or Bimbo Blond (Patreon)
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Wasn't really much into a character changing hair color, as I prefer to keep the original design as close as possible to the original.
But the issue was more that it's easy not even recognize who the character was, specially if their hair style changes too much as well.
The blond hair change can work though after this experiment, the requirement is however that the character keep the same hair style as much as possible to still resemble who they are. If you however don't change their color, you have more leeway with the overall hairstyle growth.
Though Twilight is quite iconic with her purple/pink stripes, so interestingly enough she has way more freedom to be designed differently