Creating parental control and security apps for Android using Android Studio and Kali Linux can be a valuable niche in today's digital landscape where online safety and privacy are important concerns for parents. By leveraging the power of Android Studio for app development and Kali Linux for security testing, you can create robust and feature-rich applications that cater to the needs of parents who want to protect their children from online threats.

Here are some steps you can follow to create such apps:

1. Define the Features: Start by outlining the features and functionalities you want to incorporate into your parental control and security app. Some common features include content filtering, app blocking, time restrictions, location tracking, and monitoring of online activities.
2. Design the User Interface: Use Android Studio's graphical interface builder to design an intuitive and user-friendly interface for your app. Focus on creating an interface that is easy for parents to navigate and customize according to their preferences.
3. Implement Parental Control Features: Utilize Android's built-in features and APIs to implement parental control functionalities. For example, you can use the Device Administration API to enforce app restrictions and permissions, and the Usage Stats API to monitor app usage and screen time.
4. Implement Security Features: Enhance the app's security features by integrating Kali Linux tools and techniques. For instance, you can incorporate vulnerability scanning, network monitoring, and intrusion detection capabilities using Kali Linux tools like Nmap, Wireshark, and Snort.
5. Test and Debug: Thoroughly test your app to ensure it functions correctly and securely. Use Android Studio's debugging tools to identify and fix any issues or vulnerabilities in your code. Additionally, you can perform penetration testing using Kali Linux tools to assess the app's resistance against potential attacks.
6. User Feedback and Iteration: Release your app to a limited audience or beta testers and gather feedback on its usability and effectiveness. Pay attention to user suggestions and concerns to improve your app in subsequent iterations.
7. Publish and Maintain: Once you are satisfied with the functionality and stability of your app, publish it on the Google Play Store or other distribution platforms. Regularly update your app to address security vulnerabilities and compatibility issues with new Android versions.

Remember to comply with legal and ethical guidelines when creating parental control apps. Respect user privacy and ensure transparent communication about the app's functionalities and data collection practices.

By focusing on creating a comprehensive and user-friendly solution that addresses the specific needs of parents, you can establish a niche for your parental control and security app in the Android market.