I have a theory about anime hair. I think certain colors mean different things. I haven't figured them all out, but here's what I have.
1. Red: Usually very sexy and yet unlikely to ever get their true love unless they are the main character.
2. Dark Blue: Smart
3. Light Blue: Smart, but people think they're ditz
4. Gray/white/or gray-blue: Likely to betray people at some point, either on purpose or because they are being forced to (Note: Does not necessarily apply to old people)
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