So does light blue hair color mean pretentious? Or is that associated with depression.. not to be confused with blue black hair color.

Also what does green hair color mean?

This is actually from a larger series about different characters with different hair colors. I can't read Japanese so I don't know blue's deal, all I know is that the relationship in that story is straight :( and we'll work on it after pink.

Oh there's also an orange, though no green iirc.