Dairine is Nita's younger sister. She is good with computers and Nita often feels outshown by her. She becomes a wizard in High Wizardry.
Dairine has a hot temper and she is confident in herself. She forms strong opinions of others.
She appears in all of the books, although she is sometimes a minor character.
Dairine E. "Dair" Callahan is a brainy child, wise beyond her years. She is known for being obsessed with all things Star Wars and wants to be a Jedi. Although she is three years younger than Nita, she cannot stand it if Nita knows anything that she does not. She figures out that Nita has odd powers, finds out about wizardry, and in High Wizardry becomes a wizard herself, enormously powerful and prematurely skilled, though, as with all wizards, her sheer power diminishes with time. Her Ordeal is a pivotal moment in the history of the universe, as she not only temporarily becomes the Manual, but helps to redeem the Lone Power. Dairine's skill comes through computers, and she is mentally connected to a race of silicon beings and their sentient planet. She calls her computer (which is also her Manual) Spot. There is speculation that she has romantic feelings for Roshaun. According to the New Millennial Edition of High Wizardry, her birthday is October 20, 1997.