Tessa says her favorite word is "mystery". She is 10 years old.
Mystery Tessa is one way to refer to her to distinguish her from "Adventure Tessa" who has the same name and age but a different favorite word.
The same image is also used for a girl named Cailin who is eight and likes "gymnastics".
Interview for WYFW[]
I like "mystery" because I feel like it brings out a lot of suspense, and it makes me think, "ooh, what's the mystery gonna be", and, it's sort of like a brain-- like a brain twister, because you really want to know what it is.