One of the more level-headed puchidols around, it's often seen helping out with office work and actually gets stuff done with paperwork—way more reliably than Kotori does. Despite having no visible wings, it can fly and has even managed to carry the Producer while airborne, though it clearly strains under the weight. It's pretty agile too, quick to dodge danger by taking to the air with impressive acrobatic moves.
The main catch is that it depends heavily on its eyesight. It has this habit of wearing a sleep mask while dozing off, which means if something startles it awake, it'll panic and just fly around randomly until it gets its bearings back.
It communicates with "Pi!" and "Pii!" sounds.
Piyopiyo actually showed up in the SP DLC catalogue 3 before making its manga debut in Chapter 10. Interestingly, it's the only puchidol that didn't appear on either of the drama CDs—voice actress Juri Takita was pregnant during recording at the time. The Producer discovered it, and Chihaya ended up naming it.
Content compiled by AnimeList.moe from publicly available sources.