An Alexa enabled door lock with face recognition and remote control.
Home Defense System with Alexa, OpenCV target finding, and a really cool nerf gun.
Home Assistant is an automation platform that can track and control all kinds of devices and automate actions, which fits well with AWS IoT.
Use Walabot and a vision system to identify new objects arriving in the roving space of the robot. Alexa will be used to command and control