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There are many things about japanese culture, that are just weird... But the fact, that they are putting blood type on character sheets makes me seriously uncomfortable for some reason...
Seriously, they are fictional characters. Why the fuck do you need to know their antibodies? 
@LukeAlmighty I’ve been asked about my blood type by Taiwanese friends. They do believe in horoscopes. Couple of years ago one lady wrote a bestseller book and made fortune by telling them about western zodiac.