Well, a 'yandere' character in fanfiction often brings intense and possessive elements. In a 'yandere Pacifica x Dipper' fanfiction, Pacifica might show extreme jealousy and over - protectiveness towards Dipper. It could lead to a lot of drama and conflict as Dipper might not be fully aware of Pacifica's yandere nature at first. This kind of pairing can create unique storylines that explore themes like obsession, love, and the darker side of relationships.
In 'yandere pacifica x dipper fanfiction', one aspect could be how Dipper's character would react to Pacifica's yandere tendencies. He might be initially attracted to her charm but then become frightened as her possessiveness grows. Pacifica, being a yandere, could go to great lengths to keep Dipper all to herself, perhaps even trying to isolate him from his friends and family. The fanfiction could also play with the idea of how the Gravity Falls' strange and magical setting might either exacerbate or mitigate Pacifica's yandere behavior.