The puzzle piece items for the deco pierce exclusive characters are indicated on the refill sheets that they come with.
As for Pierotchi...
- Circus Dog (サーカスドッグ), Restaurant**
- Magician Dress (マジシャンドレス), Kiramori Shop**
- Juggling (ジャグリング), Tama Depa**
** Items are available via the Tama Star Circus pierce