1.) Thimble, while she loves traveling with her family's circus, has grown bored of the carny life. Scholarly, much like her mother, she desires to collect knowledge on many subjects. Mainly, she wants to learn about magic. Ratfolk have passed down many stories of a time when magic was bountiful, but things have changed. She wants to know why and how it happened.
2.) When she's not adventuring, Thimble dresses smart and feminine. Long, flowing skirts paired with button-up tops or fitted trousers with a patterned vest. Also hats; she very much loves hats. She likes to present herself in a prim and proper manner, partially because people assume ratfolk are messy and disorganized. Adventuring wise, she wears loose, comfortable clothing with leather armor. And a pair of ridiculous goggles for safety.
3.) Thimble is trained in occult knowledge. While her family disapproves of her messing around with those sorts of things, occultism is her special interest. She's barely scratched the surface with her research and intends to further her studies. Not for nefarious or selfish purposes; she simply likes the challenge of uncovering what's been deliberately hidden from most.