Katie Gardner

Katie Gardner is a demigod daughter of Demeter and used to be the head counselor for cabin four at Camp Half-Blood. Miranda Gardiner is her deputy taking over since Katie is not a year-rounder.

The Last Olympian
Katie makes her first appearance in The Last Olympian, a member of the Demeter cabin, and its counselor. She apparently knows Percy, Annabeth, and Grover well. During the War Council Meeting, it is found out she has a bitter rivalry with the Stoll Brothers. She suggests the spy is one of Luke`s siblings.

Katie rides on the strawberry trucks along with the rest of the campers from Camp Half Blood to the Empire State Building, and prepares to defend the city. During the battle she was ordered by Percy to take her cabin and defend the Brooklyn-Battery Tunnel. Later on when the fighting got closer to the Empire State Building she was heard yelling to hold their lines. At the end of the book, she reports to Olympus, telling Percy that she saw Rachel go out of the Empire State Building, unharmed.

Personality
Katie is very kind and patient, yet passionate and willing to risk her life for the gods. Katie is said to remind Percy of her mother, Demeter, by her bossiness and the way she argues. She dislikes the Stoll brothers (Connor and Travis) because they put chocolate Easter bunnies on her cabin's grass roof.



Powers
Katie has the ability to grow and manipulate plants, like all the other members of the Demeter cabin, and like their mother. She uses her abilities in the battle of Manhattan to grow a near-impenetrable wall of poison ivy and thorn bushes to halt the advances of many monsters. She and her siblings also "turned Fifth Avenue into a jungle". And they help to grow strawberries to help fund the camp.

Appearance
Katie is described as a pretty girl with long brown hair and large green eyes.

Relationship with Campers
Katie gets along well with Percy, Annabeth, and Grover. She may be rather stern with everybody though, because her mother was mentioned to be rather stern. It is revealed in The Last Olympian that the Stoll brothers have somewhat of a rivalry with Katie, ever since they decorated the grass roof of her cabin with chocolate Easter bunnies as a prank. There's a fandom name for her relationship with Travis (Tratie), but nothing was ever written in the books about them, so it just a popular couple in sites like fanfiction, etc.

Trivia

 * Katie and Miranda Gardiner have similar names except in Miranda's name there is an "i". If this is an error by Rick Riordan, it is unknown.
 * Persephone is her Half-Sister, meaning, Hades is her half-brother- in-law as well as her uncle.