Kasey Katherine Miller is the 13-Year Old Founder of the New Babysitter's Club. She is Based on Kristy Thomas and Sabrina Carpenter.
- Full Name: Kasey Katherine Miller
- Parent(s): Kristy Thomas-Miller (Mother) Bart Miller (Father)
- Age: 13-14 Years Old (2014-2015)
- Sister(s): Genevive, Lola, Dana, Serena, Anna, Zoey, Megan and Wendy Miller.
- Brother(s): Beck, Sam, Chase, Matthew, Vick, and Tyler Miller.
- Birthdate: July 1st, 2001.
- Occupation(s): 8th Grade Student, Club President, Babysitter.