How are the birthdays of anime characters decided? Did you ever think about it when you conceived it, or did you take the day when the characters appeared in the comics as the standard?

Some authors try to save trouble. For example, when a ghost has money, Jibo decides that a character's birthday is April 4th and May 5th. Others are more serious. For example, when Ozaki decides a character's birthday, he will read astrology books to see if the "lover's" birthdays are different. Others just ask the assistant's birthday and add it directly to the work. For example, in Tatsuya Egawa, if a character has a prototype, then take the prototype's birthday as an example. Birthdays of people, such as Takehiko Inoue, are the last category. Just turn to a page and choose the representative called Mitsuru Adachi.