Just like Dipper, this little thief loves to pinch spoons as well as hats, glasses, scarves, ribbons, wool and bells.
If she can find an item she takes a particular liking to she might wear it.

Harley enjoys climbing trees, which is where you are most likely to find her.
She likes to swim and is very chirpy (seriously, she chirps a lot)

You may have noticed that she and Tenjadi have similar markings. Thats because Harley was born with her markings, where as since he was young Tenjadi had heard stories about Harley and found her very interesting and wanted to know more about her. Seeing as he has never met her, he has become passionate about finding her.