Addon Fell sans V2

Underfell Sans looks very similar to his Undertale counterpart. He is a skeleton with sharp teeth, with one being gold. Sans's red eye shows to reflect how “corrupt” (mainly emotionally hopeless) he’s gotten, so when it flickers, it would be yellow and orange. Sans holds in a lot of emotional stress, so he’s constantly radiating his powers and eye 24/7, which mostly affects his jacket fur.

He wears a black winter jacket with a jacket fur flame hood and a gray cotton hoodie, and a red sweater with a golden chain with black pants that have yellow stripes going down. He wears red shoes with yellow socks. Sans wears a black jacket, with the "fluff" at the collar being notably more ruffled than the original Sans'. His shirt is a red color in contrast to the normal white shirt. His shorts have a yellow strip instead of a white one and he wears black/red/white shoes or red slippers, as opposed to his counterpart's light blue slippers. His body structure appears the same as his counterpart (besides his teeth).

Personality

Fell Sans, much like every other monster in Underfell, is a darker and edgier version of the original Sans.

Sans can be harsh at times. He is not into puns that much, but he likes knock knock jokes. He often gets tired, but not flustered. He has an allergy to cats. He strives to be cool and collected.

Fell Sans makes appearances in both of the UnderTale Comics, where Sans appears as one of the three bosses along with UnderFell Papyrus and Asgore.