Joy Osmanski as Jing (season 2–present recurring season 1), Duncan and Kimberly's adopted five-year-old Asian little sister who has an open crush on Duncan, though she loses romantic interest in the second season.Octavia, Bex's grandmother who is oblivious to her granddaughter and her friends' shenanigans and occasionally is pulled into their schemes.The third season episode "(Work) Marriage Story" reveals her name is short for Elizabex. She later rebuffs this and says how could she be a boy when she has boobs. Bex, Duncan's tomboy friend who is seen as one of the boys.
Yassir Lester as Yangzi, Duncan's friend who supports various brands on Twitter and thus gets a lot of free stuff from these brands.He has issues at home and acts aloof and disinterested in things. Zach Cherry as Wolf, Duncan's monotonous friend and the object of Kimberly's affection.Riki Lindhome as Kimberly, Duncan's angsty, awkward, Wiccan 12-year-old sister with a midriff shirt who struggles to be popular in middle school but fails and bullies Duncan in return.
Annie, mother to Duncan, Kimberly, and Jing, and Jack's wife who is a meter maid that strives to be a detective.He has a crush on Mia and refers to his best friends for advice and help. Duncan, an average teen who is average in every way who has a dream world where he is everything.The main characters of Duncanville (Counterclockwise from left) Annie, Jack, Duncan, Kimberly, Jing (below) Main