The significance with regards to the birthdays is that they fall on the same days of the year as the birthdays of the seiyuu that played them. (n.b. the date given for Priss is that of her first seiyuu; the alternative is Nov. 17)
--Cpt K (whose mother, and twin brother and sister share the same birthday which means I can forget to get them anything much more efficiently)
--Cpt K (whose mother, and twin brother and sister share the same birthday which means I can forget to get them anything much more efficiently)