SunnySideUp likes ABBA, Taylor Swift, Dandelion flowers, and loves Avocado Toast and Coffee. She is quite sweet, but is also very sassy and spoiled by her Pa Tubbo who calls her a "Material Girl". On her first day Sunny is shown to demand expensive things, such as a moving home and gold blocks. Upon meeting new people (such as Etoiles on her adoption day) they admittedly become more shy, hiding behind Tubbo upon first contact until he tells her who they are.

She can be a bit bratty and spoiled,