Debbie Stewart

Debbie Stewart is a major character in The Dawn of Monster Kid. She is the twin sister of Max and Ava, younger sister of Megan, older sister of Daisy and adoptive sister of Cora.

She is voiced by Kristen Schaal, known for doing the voice of Mabel Pines in Gravity Falls.

Biography
Debbie along with Ava and Max were born on the same day.