List of The 39 Clues characters
Amy and Dan Cahill (both from Boston,who are kids that took up the quest). Nellie Gomez (Also from Massachusetts) serves as their au pair and supervisor. They are the protagonists of the franchise. Amy is fourteen years old while Dan is eleven. Both of them have jade eyes. Amy is shown to be intelligent and analytical, while Dan is more active, with a photographic memory. Amy, however, is agoraphobic and pyrophobic,; while Dan has asthma and is claustrophobic. They were both wards of Beatrice Cahill since the death of their parents Hope Cahill and Arthur Trent. Throughout the hunt, Amy, and Dan provided the least power to search for the Clues. Surprisingly, they have collected as many Clues as everyone in the hunt, with the help of Nellie Gomez . In the end, Amy and Dan reunite the Cahill family altogether, bringing peace to every Cahill who worked almost 500 years for finding the 39 Clues. Following the events of Into The Gauntlet, and after making peace with Ian and Natalie Kabra, Hamilton Holt, Alistair Oh, Sinead Starling and Jonah Wizard, Amy is named their grandmother Grace's successor and head of the family. They are now in custody of Nellie Gomez and Fiske Cahill. Their branch is revealed late in the series to be Madrigals; the secret fifth branch descended from Madeleine Cahill. Amy's official card is No. 18 while Dan's is No. 2.
Donovan Patton
According to Traci Paige Johnson, one of the producers and creators of "Blue's Clues", Patton's character was more like a preschooler and more innocent than Steve. Angela Santomero, another producer and creator, stated that Patton's characterization as Joe brought him closer to the preschool viewer as Joe was more willing to "jump into a problem rather than figure it out first like Steve". Patton liked working on "Blue's Clues" because, as he stated, "I got to go be a kid for twelve hours a day". He called the show's crew "a real fun little family" and a "well-oiled machine" by the time he joined the show. Patton remained on the show for 50 episodes, until it ended its run in 2006, and also appeared in its spin-off, "Blue's Room", which premiered in 2004. Several years later, Patton said he had not yet grasped the enormity of replacing Burns, even after he became a parent and witnessed the show's effect on his own children. He admitted that he preferred when his two-year-old daughter watched the Steve episodes.