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Popperz Chronicle MZD contains unused animations of Tentkant's piano and fish meant to be part of his FEVER! animation. Below is what it (possibly) could have looked like.
In the game's story mode, MZD and many other characters have unique expressions that are used throughout the game. Interestingly, MZD's ingame sprite includes his eyes, which cannot be seen normally in game due to being covered by his sunglasses.
The e-Amusement app holds periodical events where users can collect items to customize their profiles. Each event comes with a theme that is announced at the beginning of each period, the event theme for this period being "Myth" and was held during June 16th - July 11, 2021.