Reader Rabbit is the protagonist of all the games; a greyish blue rabbit. In Reader Rabbit Math Adventures Ages 6–9, when the Sealion is wrecked, he plans to fix it while Sam the Lion was on a search for parts. In the 1986-1993 games, he wears a red t-shirt rather than his trademark red sweater. In the 1996-present games he wears a red and blue striped sweater, and in the 2000s games, he wears a red sweater again and blue jeans. He could sing “doo, doo, doo, doo, doo, doo” really softly. He also appears in the Stage Show activity of Reader Rabbit Toddler. He is Bugs Bunny's medium sized brother and he is the titular character of the series.
Bugs Bunny might be in Reader Rabbit's family tree, because both of them look the same, and Bugs Bunny is only older than Reader Rabbit. Bugs Bunny might be a cousin of Reader Rabbit's father or paternal grandfather or maternal grandfather.