Phineas and Ferb: Cheryl

Cheryl is a real estate agent hired by Dr. Doofenhsmirtz to sing his new evil jingle.

Gravity Falls: Candy Chiu

Candy is one of Mabel's best friends. Candy is shy, insecure and does some strange things, such as taping forks to her fingers as an "improvement of human being".

Fantastic Max: Zoe Young

Zoe is Max's older sister who is occasionally dragged into her brother's adventures. Max doesn't think very highly of her, and often calls her dumb. She is rivals with her next door neighbor, Ben. She frequently becomes suspicious of her brother's travels, but Max puts her to sleep so she can't reveal their secret. She is usually reprimanded (and grounded) at the end of Max's travels, especially by her strict Dad, for her impish and mischievous behavior.

Valley of the Dinosaurs: Katie Butler

Katie is Greg's older sister. She is very smart, and does her best to keep Greg out of trouble.