Emerald VS the 8 fragments

(Co-op work, possible solo to harem story, based off of Scott Pilgrim VS the world) What if Marceline and Bubblegum had a falling out of sorts thanks to a prank of Marceline's and shortly after she meets a new friend who would help her in many ways, enjoy what happens when the main OC (You know its Emerald by now people) fights 7 people for fragments and defends Marceline... enjoy.