Read Triangulo illuminati from the story Típico de Fallers by jennyomghappy (Jenny_Omg) with reads.
Her dad is a octopus man ( slenderman) so that's why she is so creepy. Soos seas her dad is an octopus man in Soos and the real girl. So when slenderman was spotted in gravityfalls it was Giffanys dad
mabel gravity falls - guys I really wanna be her for Halloween