This looks like a lot of fun. It would probably be a bit of a challenge to make everything part yourself, so they supply a long list of interesting parts that connect and create your custom character. And best of all, you get to 3D print that baby out right from the app.

It's on iOS, Android and Windows. Fun and easy app for parents and kids, designers or anyone. You can also download your files and upload into Tinkercad to modify or create new designs. New designs will be released around May for Maker Faire.