My Undertale Tumblr is at Bryophyta-AU if you’d like to see more of this stuff :)

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[ID: Pencil and marker illustration of Sans as a mermaid. He has a skeletal face, chest, and arms while having a fleshy neck, stomach, and fish tail. He's based on Atlantic bluefin tuna. It has small sharp fins, fat and muscular body shape, and blue stripes with yellow accenting. The fleshy areas look more like skin than scales. Sans' pose is confident, smiling and puffing out his chest somewhat, arms out to the side. end ID]