Flavorwire has this wonderful infographic: a calendar of fictional characters' birthdays.
We learn that Bruce Wayne was born on the 19th of February, which means that Batman is a Pisces, an astrological sign whose life pursuit is "to avoid feeling alone and instead feel connected to others and the world at large." Pisceans are also "mysterious and alluring individuals," and "are frequently torn between two pathways in life, or actually do live two very different existences at the same time." I'd say that fits Batman, er, Bruce Wayne to a tee.
Other interesting discoveries:
>Lisbeth Salander (30 april 1978) and Ted Mosby (25 April 1978) were born within days of each other
>Ted is two years older than Robin Scherbatsky (23 july 1980)
>I'm almost the same age as most of the characters in Harry Potter--most of whom were born in 1980, except Hermione Granger (19 September 1979.) Why, hello, Hermione.
>Buffy Summers is 31 (19 January 1981)
>Carrie Bradshaw (15 june 1966) is 46!
And Liz Lemon (14 oct 1970) is a Libra.