This character's name is completely normal, and not unusual

This character's name is completely normal, and not unusual (or Thissy for short) is a character that first appeared in Throwback Thurzday.

Throwback Thurzday
She is seen doing a dance from a version of Fortnite hacked by Plankton, along with Odie. When she finds out it is a hacked version and not the actual Fortnite, she goes to Epic Games Studio, where she throws Plankton into a computer.

Target Grill
She appears during the final round of the cook-off.