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

Mickey666maus's Oled Animated Eyes For ARC Pro And ARC Free
To set the project up, the following hardware is needed: 1x https://www.adafruit.com/product/3800 2 x...

Zxen's Robomannequin
This is Eve. What do you guys think so far?

Justinratliff's Jd Spock
The first video of my JD Spock testing his 3d printed phaser. JD Spocks 3D printed Star Trek Original Series phaser,...