Sofia the First and Undertale Crossovers
Sofia the First: (Underground Adventure) by black cat studio reviews
When Sofia falls into the Underground she meets nice and evil monsters along the way. Yet she is haunted by a demonic human who wants her to kill just like the talking flower. She makes friends with other monsters along with the king of the Underground. Her heart's goal is to free the monsters from the Underground. She isn't alone her siblings James and Amber come afterward.
Rated: K+ - English - Adventure/Friendship - Chapters: 4 - Words: 7,566 - Reviews: 14 - Favs: 15 - Follows: 16 - Updated: 12/23/2016 - Published: 11/29/2016 - Amber, James, Sofia, Sans