音同玺，意同“喜”，表示高兴喜爱，形如印章
首次出现在羊踯躅LOGO的右上角
The character Xi（憙）,is made of 2 Chinese characters —— Joy（喜）and Heart（心） pronounced the same as 玺, shares the meaning of joy and fondness. Its shape resembles a seal, first appearing at the upper right corner of the Yangzhizhu logo.
An extra character "Four" appeared on his personal website in 2023.
It also appeared in a modified form on the studio‘s new year gift box in 2025