Double click the flag! Back when JTRCG first came out, there was an entity that would fight the player using their own username. Although it can no longer fight you, it still remains hidden in the shadows... and it wants revenge. Inspired by the 'Night Terrors' easter egg in JTRCG's Halloween event.
FUN FACT: The original idea for this entity was for it to be a boss battle in JTRCG that would use previous game winners as cards. The design was an originally unrelated design I made for StanleyMOV's 'DM to Submit Scary Videos' videos. I decided to use the design as an easter egg for JTRCG for the Halloween Update, and the rest is history. It wasn't until writing this description that I decided that the easter egg and the entity were the same character.