When we first meet Vivian, she’s no hero. Instead, she is the youngest member of the Shadow Sirens, who have been contracted to take out Mario. The other two Siren Sisters constantly heckle Vivian, calling her ugly and blaming her for their own problems. So, when a mysterious silhouette shows her kindness, Vivian decides to help him reclaim his identity. This mysterious silhouette turns out to be Mario, whose physical features were stolen by the evil doppelganger, Doopliss. Realizing Mario is kinder to her than her own sisters, she helps him defeat Doopliss and reclaim his body. Without Vivian, Mario would be no more than a shadowy figure looming in the shadows of Twilight Town.