Humans Harry Callahan Harold Edward Callahan, Nita and Dairine's father. After his wife's death, he grows closer to his daughters and also to the world of wizardry, serving as a comforter and encourager to wizards who are going through a hard time, notably to Filif and Tom in ''Wizard's Holiday''. Harry is a florist and landscape gardener; Nita believes she gets her talents with living things (especially plants) from him. Nita and Dairine inherited their magic powers from his side of the family.
Betty Callahan Nita and Dairine's late mother, and the focus of ''
The Wizard's Dilemma. A former professional ballerina, Betty passed on both her red hair and her natural grace to Dairine. She passes away sometime between The Wizard's Dilemma
and A Wizard Alone''.
Carmela Rodriguez Kit's sister, a couple of years older than he. She bought a laser dissociator off the Mizarthu shopping network, which she uses to help Nita and Sker'ret defend The Crossings. She is in the process of learning The Speech, despite the fact that she's not a wizard. Once Carmela learns The Speech, she spends most of her time watching TV from across the galaxy, and talking to her new alien friends. She seems to have a talent for languages, as she was learning Japanese before taking up the study of The Speech, and presumably knows Spanish as well. She helps Dairine deal with the exchange wizards in ''
Wizard's Holiday. In Wizards at War Carmela also manages to free the entire group when they are captured at a crucial moment. During A Wizard of Mars'' she assists in the translation of an ancient text found in a cavern on Mars.
Helena Rodriguez Kit's oldest sister. She is away attending college and lives there. She originally believed that Kit had made a
deal with the devil. As of
A Wizard of Mars, she believes he is a
mutant.
Mr. Millman Robert Millman is the school therapist; he first appears in
A Wizard Alone to help Nita and, later, Dairine, with their mother's death. Although he is not himself a wizard, he knows of wizards and so recognizes Nita for what she is. Later, in
Wizards at War, he helps by arranging for them to get time off from school.
Non-humans Ponch Poncho (Kit's black Labrador/Border Collie mix) is an average dog. More worried about food (and squirrels) than anything else, Ponch accompanies Kit and Nita on some of their adventures. As the series progresses it is obvious that something is different about Ponch; at the beginning of the series, he is featured as a minor character, mostly a source of canine comic relief, but further on his character is developed into more of a supporting role and partner to Kit. He starts to find and even create alternate universes (his favorite being a squirrel universe) and eventually is revealed to be a canine Power, namely the canine version of the One, according to the Transcendent Pig. After this, Kit mourns his loss, only to have a stray dog come up to him and reveal that Ponch is inside all dogs now.
Peach Machu Picchu is an irascible
scarlet macaw owned by Tom and Carl. Extremely grumpy and given to showing off, she can also tell the future: her advice saves Nita and Kit in all of the first three books. In
High Wizardry she accompanies Nita and Kit to find Dairine, and they discover that Peach is actually an avatar of the Winged Defender, or The One's Champion, one of the Powers that Be. Nita recognises Peach in Ronan in
A Wizard Abroad.
Fred '''Khairelikoblepharehglukumeilichephreidosd'enagouni
, nicknamed Fred'
by Kit from the syllable phreid
in his name, is a white hole who features in So You Want to Be a Wizard''. He appears when Nita and Kit do a finding spell to try to retrieve Nita's space pen, and bears a message for Tom and Carl. Fred is the catalyst for Nita and Kit's Ordeal, starting them on a quest to find the Book of Night with Moon; he is comic in his appreciation of the delights of Earth and he becomes good friends with Nita and Kit. At the end of
SYWTBAW, he sacrifices himself by converting his mass to light, relighting the moon and allowing Nita and Kit to save Manhattan from an incursion by the Lone Power.
Ed '''ed'Rashtekeresket t'k Gh'shestaesteh'
, the Master Shark and the Pale Slayer, appears in Deep Wizardry'' to play the appropriate role in the Song of the Twelve. He is the master of his species, a
great white shark; throughout the book he is both aloof and threatening. Although he frightens Nita, they strike up an unusual friendship. He is dryly funny, although at first Nita doesn't find him so. His role in the song is to devour Nita, as the Silent One; however, at the end of the book, Ed sacrifices himself rather than let Nita die, borrowing her wizardry to take the Silent One's role in the song. But, perhaps because of this borrowed wizardry, he is seen in Timeheart in the novel's coda.
Spot Spot is Dairine's sentient Apple computer, originally an
Apple IIc variant, but later appearing to be a
Macintosh PowerBook, who serves as Dairine's wizard's manual. Spot first shows up in
High Wizardry and is present or "nearby" in the remainder of the series whenever Dairine is. He is shy around others, but (according to Dairine) is quite talkative in one-on-one conversations with her. He also has the ability to upgrade himself, changing his platform and appearance as the series progresses to keep up with contemporary technology. After getting an upgrade from his siblings (Dairine's 'children'), he seems to develop a sense of the future.
Transcendent Pig Inspired by
Chinese mythology, this is a being of mysterious origins, first mentioned in
So You Want to Be a Wizard and first seen in ''
The Wizard's Dilemma''. He has been called Chao, but it is unclear if that is a personal name or merely an epithet. The Pig is designated as being between mortals and the Powers That Be, more than a mortal but less than a Power, and is
Omnipresent though not necessarily
Omniscient. However, according to The One's Champion, not even the
Powers That Be know where the Pig came from. The purpose the Pig serves is unknown, but it is believed that it knows the meaning of life for an unexplained reason, but it does not just let anyone know. This makes it wizardly custom to immediately ask the Pig the meaning of life upon seeing it. He appears in
Wizards at War as well. ==Temporal setting==