Not that I know of. I'm pretty sure they don't put as much effort into assigning birthdays lol. However, similarly as to how I used astrological signs and birth dates in determining my character's personality, it's more common for them to show this through blood types.Having never read/viewed/interacted with anime/magna/Japanese media culture in general, is this a common thing, because I've never heard of it used specifically for a media production?
Manga authors, game developers, and the likes may sometimes mention or include a character's blood type in his description. This may not seem much, but it has taken my interest when I noticed many character sheets for animes and Japanese-based video games (Final Fantasy and Resident Evil, being some of the ones I looked into) included blood types so this prompted me to do a little research. Basically, some Japanese believe that blood types have influential factors to one's personality.
"Why Do Japanese Games Tell You Characters' Blood Types?"
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