I wouldn't know where to start but a robot that could interact with Autistic children, play games with them, use text to speech to tell them stories and help teach social skills would be a fun robot to build.
By Lemon
Other robots from Synthiam community

Danbachmann's Dandroid 20Xx
Ive been impressed with some of the amazing robots (the original EZ-Robot kits and home builts) on this site and while...

Cosplaying's Project Mini Rover
i tried to keep my second project as small as possible, and i think it turned out pretty good (though i need to get rid...

Ezang's For Some Fun, Arduino LCD Monitor And ARC Serial...
Here is a test of the Arduino LCD monitor and Arc serial monitor 2021 EzAng