Oh that’s probably just because blood types are sort of mythologized like we do astrological signs in some parts of Asia. HelloTalk is from China
https://en.m.wikipedia.org/wiki/Blood_type_personality_theory
https://en.m.wikipedia.org/wiki/Blood_type_personality_theory
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Mine’s definitely been measured before, but I don’t think I’ve ever even been told it. I imagine part of why it’s not popular here is maybe just because nobody knows theirs