I told myself I'd make a post for all my Underfell headcanons, and it's finally here! My version of Underfell actually isn't much different or darker than Undertale itself. :o
( Copy-pasted here before it gets buried under my Plurk. UNDERTALE SPOILERS AHOY )
( Copy-pasted here before it gets buried under my Plurk. UNDERTALE SPOILERS AHOY )