Katie Cassidy Fans-I Need Some Serious Help

Ok so a hobby of mine is Письмо fanfiction and I recently was дана the challenge from hell: make one fanfic that connects all Katie Cassidy characters.
Uh huh...?! I was дана 15 saves which means I can save up to 15 people that die in the stories, no Вопросы asked. Normally I can do fanfiction no sweat but this one is killing me!!!!
HELP Katie Фаны I don't know where to start!!