Characters:

Jared Grace – The main character, from whose point of view the books are written. Simon is his identical twin, although they have contrasting personalities. Jared is a brave and resourceful natural leader, good at creating plans. He is mature for his age, but occasionally mischieveous, though his intentions are usually good. In the film adaption of The Spiderwick Chronicles, he is portrayed by British actor Freddie Highmore, as is Simon.

Simon Grace – Jared's identical twin brother. He is calm and caring; he particularly loves animals, and has several pets. In the film adaption, he is played by Freddie Highmore. Simon gets bitten by an ogre and becomes an ogre in the second movie

Mallory Grace – Jared and Simon's older sister. She is an avid fencer who takes part in many fencing competitions; this skill comes in handy when defending herself against faeries. Although she can be grumpy, she also helps her brothers in their various adventures. She is portrayed by Sarah Bolger in the film adaption of the series.

Lucinda Spiderwick – The daughter of Arthur Spiderwick and the cousin of Helen Grace's mother, making her the Grace children's great aunt. She was attacked by faeries and subsequently put in a clinic for the insane. She can only eat faerie food because of a cruel joke played on her by faeries, however, a few friendly sprites provide her with food. She is portrayed by Joan Plowright in the film adaption.

Arthur Spiderwick – The author of the field guide to faeries, who disappeared after trying to fool the elves. He is portrayed by David Strathairn in the film adaption.

Helen Grace – The mother of Jared, Simon, and Mallory. She is portrayed by Mary-Louise Parker in the film adaption.

Richard Grace – Helen Grace's ex-husband and the father of the Grace children. He is portrayed by Andrew McCarthy in the film adaption.