At long last the multiple character function has been released to Idol Land PriPara as of 7/29/2026! And actually... it's working pretty well so far! Here is what I have learned about it.
There are five slots accessible by clicking on your character's icon in the top left. The first additional slot is free, the second is 1,000 gold idollars, the third is 1,500, and the fourth is 2,000.
As soon as you unlock a slot, you will name your character and then proceed to choose their character parts.
All characters have their own rank, but have access to your full inventory of character parts.
Each character also has their own profile! But as far as I can tell, this page exists solely so you can change your character's name. Yes, it costs 300 gold idollars but we can change character names again! I don't think your additional character profiles are viewable by others but please let me know if wrong.
Each of your characters also has access to your full coord inventory, and even gets their own favorite coord slots.
Characters can also create their own promises. Whatever promise you create with a character will be locked to that character. This means that if you create a promise with one character, then switch, you will get this error:
(And if you do, simply switch characters back to play the promise as normal.)
You can also (and I am so estatic because I didn't know if they were going to do this) play promises with your other characters!
Simply create an instant promise (いますぐ) and select the MyChara option (皆のマイキャラ) and you should see your other characters right at the top.
Some other quirks I've noticed:
-Characters all share the same Idol Bonus Rank (the daily mission one)
-But like mentioned above, characters have individual MyChara Idol Ranks (the numerical ones... why do we have two things called Idol Rank?) but I don't think there is much point in grinding additional characters. As far as I can tell, it slightly impacts scoring but nothing else. (There are no rank-up bonuses for additional characters I think?)
Hopefully this photo clarifies what I mean: Hinode has Luna's 50% Platinum Rank score bonus, but her MyChara Idol Rank Bonus is bronze as her MyChara Idol Rank is 1 (whereas Luna is Rank 125 and she gets a gold bonus for that one).
If you notice any other quirks, bugs, or neat things about this feature LMK!