Birthdays are a feature first appearing in Pop'n Music. All playable characters are given birthdates, whilst playing as a one of them on their date results in a different background for played songs and a celebration image after finishing the round. Birthdays can also be celebrated up to a week past the original date.
In Pop'n Music Lapistoria, birthdays remain mostly the same, though playing as a character on their birthday also grants 5 points to their heart gauge.
With an e-AMUSEMENT account the celebration images can be viewed on the Sunny Park or Lapistoria e-AMUSEMENT Gates.
- Upon choosing a character on their birthday, the game will say "happy birthday!" instead of "okay!".
- January 1st, August 1st, and August 8th all have the most birthdays of any date, with 8 each.
- August also has the most birthdays of any month, 74 total.
- May and December have the least amount of birthdays, with 43 each.