In the past few years, we have covered plenty of educational robots for kids. DINGO is an indoor mobile robot for researchers and more advanced students. It comes with differential and omnidirectional drive systems and can take on autonomous navigation, mapping, and manipulation tasks.
DINGO comes with ROS and Gazebo integration. It has a plug & play design, so you can enhance it with a wide range of robot sensors. This robot weighs 16kg and has max payload of 20kg with top speed of 1.3m/s. The above video shows it in action.