Holiday stands at about 3'6" tall, not counting her ears. She shrinks whenever she's embarrassed, and she has plenty to be embarrassed about. Aside from being so short, she's also completely diaper dependent.
She's a very serious girl, and is always trying to prove how smart and mature she is to people. She works as an accountant, and she always dresses much more conservatively than this, wearing baggy clothing to help hide her diaper. Her coworkers tend not to take her very seriously, though, and this can lead to some embarrassing moments for her.