To thrive as an Unpaid Computer Science Intern, you should have a solid understanding of programming fundamentals, data structures, algorithms, and typically be pursuing or have recently completed a degree in computer science or a related field. Familiarity with languages such as Python, Java, or C++, as well as experience using version control systems like Git, is highly beneficial. Strong problem-solving skills, eagerness to learn, and effective communication are important soft skills that set candidates apart. These abilities are crucial for contributing to development projects, adapting to changing tasks, and making the most of the internship experience.