Katie Gardner

Katie Gardner is a Greek 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 is the counselor of the Demeter cabin. During the War Council Meeting, it is seen she has a bitter rivalry with the Stoll Brothers, since they covered the whole grass roof of the Demeter cabin with chocolate Easter bunnies. She suggests that the spy is one of Luke's siblings. She is similar to her mother, Demeter, when she lectures. (Once, she yelled at the Stoll Brothers for wanting to steal things, since they are Hermes' sons.)

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. It was said that they "turned it into a jungle." Later on when the fighting got closer to the Empire State Building she was heard yelling to hold their lines. After the Battle of Manhattan, Katie reported to Percy when he came down from Olympus that she saw Rachel Elizabeth Dare leaving the Empire State Building unharmed, before taking Blackjack back to Camp Half-Blood.

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 Stoll) because they put chocolate Easter bunnies on her cabin's grass roof.

Appearance
Katie's appearance is never described in detail though she, along with the other children of Demeter, may have inherited their mother's black hair and brown eyes.

Abilities
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" during the Battle of Manhattan. And they help to grow strawberries to help fund the camp.

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. Also she works at the camp store which unfortunately for her are the Stolls favorite place to steal from.

Trivia

 * Miranda Gardiner is the head of Demeter's Cabin in The Lost Hero with no explanation as to what happened to Katie.
 * Her last name is obviously a reference to her mother, Demeter, goddess of agriculture.
 * Katie's name was actually the name of Rick Riordan's former student named Katie Gardner.