Eva Nine is a fictional character from the book series "The Last Kids on Earth," created by Max Brallier. She is a brave and resourceful girl who navigates a post-apocalyptic world filled with monsters and challenges. Eva is known for her quick thinking and strong leadership skills, often taking charge in difficult situations. In the series, Eva Nine teams up with a group of friends, including Jack Sullivan and Quint Baker, to survive and explore their new reality. Together, they face various adventures, using their unique talents to overcome obstacles and protect each other in their quest for safety and fun.