Cirno Day is an anual meme where on the 9th of November users change their avatar to Cirno and be as egotistical as possible. Only two users do this however the two are Fllourine and 5555thExplosionMage. Many times on the first year of doing this 5555thExplosionMage was told they'd be kicked or banned.
- The meme started in DBF on November 9th 2016.
- Cirno now has an emote on the wiki that is triggered by (cirno), (weakfairy), and (Mighty No.9).