Vivian is a calm, brooding and cunning woman who served Hendrickson with much if not greater loyalty than Helbram. She has an extreme hatred of pigs shown when she encountered Hawk to which she snapped and teleported the talking pig to a faraway place from herself. Vivian also show great resentment towards the Seven Deadly Sins for reasons unknown as she stated to have loved them once before and encouraged Gilthunder to finish Meliodas off through telepathy. She has some sense of honor as she allowed Elizabeth's wish for her sister Margaret to be released from her cell, although she mocked the latter's cowardly nature and allowed the king and his daughter to have a brief family moment before proceeding with the ritual. 

According to Merlin, Vivian has a habit of losing herself to rage. Vivian appears to be very emotional and clingy toward Gilthunder, as she wants him all to herself and gets very emotional and sad when she loses him. She wears a mask to hide her face mainly because she lacks self-confidence.

Vivian is obsessed with Gilthunder, believing and supposing that he is her property. She takes advantage of him by taking Margaret Liones as a hostage, forcing him to obey all of her orders. Even afterwards, Vivian still pursues to make Gilthunder her own such as making a love potion for him, only to be thwarted by Meliodas.

During the fight with the Ten Commandments, Vivian disguised herself as a mage named Gilfrost to get closer to Gilthunder. Once her ruse was revealed, she teleported him to a castle in an effort to make him hers. Gil was furious, and demanded her to return him to others, but she refused trying to make him believe everyone was dead. He did not hesitate to use the curse on her that Merlin placed on her in order to release him from his capture. This only enticed her further.

Gilthunder on his part, though he tried to let her down gently about his feelings for Margaret, became increasingly angry and frustrated over Vivian's obsession towards her.