A counselor at Star Group, Sunny is always smiling and encouraging others while overseeing mandatory craft time. She does find it strange that they mass produce quilts and candles, but she assumes they are being stored for an emergency. Sunny is oblivious that she's in a cult and believes she's in a summer camp with lots of happy people.
Each mastery level adds another card to the cardpool for defeating Sunny. Each of the bronze, silver, and gold mastery levels unlocks a new card, while it takes all three diamond and onyx levels to unlock a single card.