More placeholder as in you use him to build a prototype of your idea, and then replace him altogether. But since I've added the Spriter files you could potentially use Spriter to replace the body parts by yourself while maintaining the animations :)
Viewing post in Mr Placeholder Jr. Character comments
It's a software by BrashMonkey. It's basically a tool with which you can animate characters. It works a bit similar to how Unitys animation tool works