Villian

Villian (ヴィリアン) is the 3rd princess and Queen Elizard's youngest daughter (currently aged 24). She's caught up in her sister's rebellion against her mother and was planned to be executed. She's later saved by Acqua of the Back, aka William Orwell, whom she takes a liking to, ever since he saved her ten years ago. She later allies up with the Necessarius and those that are against Carrisa's rebellion. .

Background
Of the three princesses, she possess the trait "virtue". , Princess Villian has stated that she had refused to undergo magical training as she doesn't like the idea of gaining abilities that could be used as weapons ; thanks to that the refinement of her magic power is capped as zero, similarly to Index's case.

Personality
Villian's personality is a passive one, Elizard pointed out that Villian takes others into such high consideration that she barely has opinions of her own; and that her personality could lead her almost to the point that she needs to depend on others to survive. Despite that Villian can show resolve if necessary, and due to her trait of "virtue" she can gather around her valuable people that can aid her in her endeavours.

Design evolution
Villian's design remains static throughout the series. According to Haimura, she was designed similarly to Tina (Terra in the English releases) of Final Fantasy VI fame, but most specifically, her appearance in Dissidia Final Fantasy.

Trivia

 * Kaori Kanzaki and Tatemiya Saiji warned Kamijou Touma that if he gets involved in any embarrassing accident with the princess (such as, flipping her skirt), that would be considered lèse majesté ; certainly enough, Index was quick to point when Kamijou's misfortune caused Villian to end up in an unsightly accident.

Quotes

 * (Volume 18) : “…Even if I am a princess, I’m not that sheltered” -- Stated as she was driving a car.