When pre-registration was first released on April 13, 2017, usernames could be between 3 and 20 characters. When Experiment #1 was released, players could create account with usernames between 3 and 25 characters. During pre-registration and for the first few days of Experiment #1, it was possible to create accounts with emojis and non-Latin characters.
Nickname approvals were fixed on May 3, meaning that names should no longer show as "Hamster" for some players.
Nicknames will be able to be changed at the release of Experiment #5.
A username underneath a hamster critter in-game