Underfell Asriel always has intrigued me, especially during genocide. I know Flowey is nice, but what if you kill everyone? I don't know what would happen in Underfell, but I formed a little headcannon

//I tried a new style for him here//

I had to kinda make up this design, because I couldn't find any full body Underfell Asriels in this form.

So yeah. That's my genocide Underfell Asriel.