Jacob Two-Two Jacob is the youngest child in his family and tends not to be heard. As a result, he repeats everything twice automatically, which is the origin of his nickname. (See
Jacob Richler.)
X. Barnaby Dinglebat Jacob's next-door neighbour is an international spy, working for CMIST (Canadian Ministry of Intrigue, Spying, and Tattling). Jacob later helps Mr. Dinglebat and his agent Intrepid (a hamster) on top secret missions.
Morty Jacob's dad, the writer of the popular "Amazing Ronald" books, is said to be based on
Mordecai Richler. He is described as being fairly laid back and easygoing.
Noah and Emma Jacob's older twin brother and sister respectively. The two of them are avid readers and wrestling fans, but they do not take Jacob seriously and treat him like a nuisance who cannot keep up with them. They form a superhero team known as "Child Power" and refer to themselves as Fearless O'Toole (Noah) and Intrepid Shapiro (Emma). They pick on Jacob a lot. (See also
Noah Richler and
Emma Richler.)
Marfa Jacob's oldest sister, who is vain,
loud-mouthed, and short-tempered but very smart. While she and Jacob argue a lot, she is proud of his achievements and they care about each other. (See
Martha Richler.)
Daniel Jacob's oldest brother, the epitome of cool in Jacob's eyes. He treats Jacob like a nuisance at times, but also seems to take him more seriously than Noah, Emma, and Marfa. He likes music, especially classics like the
Beatles. (See
Daniel Richler.)
Florence Jacob's mother, who takes everything in her stride.
Mrs Sour Pickle Jacob's geography teacher Miss Sour Pickle has a permanent scowl plastered on her face, like she smells something bad. She glories in catching her students not paying attention or talking in class, then giving them snap quizzes on the obscure capitals of equally obscure countries. The only thing Sour Pickle loves to do more than torment Two Two is cheer for her favourite team, the marvelous Montreal Marvels. It's her biggest secret that she simply adores hockey.
Miss Darling Sweetiepie An adorable little old lady down the street constantly roaming about offering everyone she meets delicious baked goods.
Buford An odd little kid with a string of unfortunate names. His full name is "Buford Orville Gaylord Pugh". His lack of anxiety and worries aren't due to a lack of intelligence but more to his inability to focus. He is prone to recounting pointless, shaggy dog stories at the drop of a hat. Buford and Jacob are both new at school. ==Media adaptations==