>.<

What a star sign has to do with this?

Agreed

I have nothing against the plot or the author (and not that I care much about astrology), but it is said that he's a Virgo and so far he has not shown any trait of a "Virgo", he just acts immature, like a spoiled brat.

Do you srsly believe that mangakas research about star signs before giving them to characters? As a child raised by an astrology obsessed mother, i have to tell you that in all the stories i read and watched so far star signs are occurred in around 15%.