I looked into it and killer sans is just Sans with crying eyes and a circle thing on his chest. something you could probably create from a normal sans and as for outerfell sans, it’s just a recolour.

So in other words no I can’t create this for you sorry

Aren’t we all

I just realised our profile pictures are similar now.

Go visit him and throw a tarantula on his bike.

Green = Online
Red = Offline

Sean is your stand?

Okay

A colourable heart you say? Well i’m sure you can find one in the Stickfigures section on this site. The same goes for underfell sans.

Oh by the way I have no idea about Underfell or other Undertale characters, I just recognise a few things here and there.