I think Pizzarina will be a Darkner Pizzapants meets in chapter 5 and she is ultimately a result of Bratty’s and Nice Cream’s involvements in accidentally creating her.
>”if it makes him happy, too...” - Bratty
>”As long he’s happy.” - Nice Cream guy
For a prank, these words seem to imply a tragedy. Of Pizzapants being happy but GONE with her.

However… we have already have met her…

You see, Kris implemented himself into the prank as well. And even made a post directly to Pizzapants during his conversation with Bratty in chapter 4…. That means,

SHE IS ERAM!!!! She is ICE-E!!!!
This is the pizza babe following us and Pizza Pants the whole time. Made by the imaginations of multiple Lightners. Noelle’s fears of Ice-E, Kris’ joys of wearing her fiery [pizza box] Ice-E face till it was lost by the BUNKER, Bratty’s rotten personality and tsundere desire for Pizzapants, and the [Ice-E costume performer] Nice Cream guy’s love for Pizza Pants.

“We both have work to do. So if you want this mantle, hurry up and take it.”
Her work is about taking Pizzapants!!!! The dread Kris is feeling about Ice-E getting replaced is about Eram taking her spare moments of time taking away Pizza Pants before her presence is over! The festival is the only chance she has to do it. And there is nothing you can do to stop her.