This is basically the SONIC12 version of "True EXE."

In this design Sonic12 replace most of its body to mimic human anatomy, hence why it's called humane, and it uses this design as an easy way for it to cross from its world and reality without looking out of place in its standard form.

It uses this look to trick possible bystanders to believe that it’s a murderer cosplaying as Sonic, as it breaks its victims body so they won’t get to leave its world EVER... which I will explain the victims later on.

To make the atmosphere much better, it would be inside the shadows lurking or doing its killings in the dark. If someone sees it, it will kill them. No witnesses.

It barely uses this design in-game. Only outside its world or just for fancy occasions.