Because she's supposed to be like this? She is the negative one out of the group.
The poltergeist ensemble!The precious child of the Scarlet Devil Mansion, swooping in on the wings of destruction!The little sister of the devil, Flandre Scarlet!With an enthusiastic entrance, the first one to jump out is...Lunasa! Merlin! Lyrica!And to liven up tonight's party, we have, standing on the stage...The Prismriver Sisters!