Katie

Katie is a brown-haired girl with pink streaks in her hair seen sitting behind Tess during The Mystery of the Robot Rivalry

She has blue eyes and wears a blue wristband. She has neon pink pants and a pink scarf matching her streaks. She seems to be wearing a shoulder-less green sweater atop a yellow shirt which does have shoulders.

In The Staticy Shuffle Stumper she teams up with Dinara.

They also form the Mean Girls Detective Agency. Both have purple streaks in their hair and want to bully Addison even if it means robbing people.