The Big Boss himself!

Here's Rantaro - or Honcho, whatever you want to call him!

As a Demon Slayer, his Breathing Style would be Stone Breathing, and he would know all five forms.

As a demon, his Blood Demon Art would be Mountain Quake. His gigantic hands are strong enough to crush boulders on their own, but when he slams them onto the ground, he can create tremors that are violent enough to topple entire mountain ranges. If he slams his hands onto the ground in rapid succession, he can even create tremors strong enough to move tectonic plates.

What do you think?

And who's next? THE DEMON QUEEN IS NOT SATISFIED!!