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?
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.
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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