Ririchiyo Shirakiin

Ririchiyo Shirakiin is the main protagonist from the Inu x Boku SS anime and manga.

A half-human, half-oni high school girl who transferred to Room 4 of Maison de Ayakashi in order to live alone. She yearns to be independent and constantly worries about not being able to communicate with other people properly, one of her reasons for moving. Her SS agent and servant is Soushi, a fox spirit she'd unwittingly saved, although she's not aware of it.

Human Form
Ririchiyo is a petite young girl with long indigo hair and violet eyes. Her hairstyle is only slightly different in Part 2. In the final chapter, her hair is cut shorter. She has full legs and her cheeks are noticeably chubby.

She wears many different types of clothes, but is mostly seen wearing her black deep V-neck dress with four buttons on each side and no sleeves. Underneath, she wears a white long-sleeved ruffle blouse. She is often seen wearing plain black shoes with gray thigh-length socks.

Youkai Form
In her youkai form, she grows two curved horns along with a flower on one of her horns and is taller by a few centimeters, as she wears Zori. Her outfit is a dark red hakama with a mini-skirt. She wears black arm bands and bracelets on each wrist. There is also a Hannya mask hanging on the back of her waist. She wears black stockings and black/red Geta shoes. A naginata is present when she transforms; the traditional Japanese bladed, spear-like weapon is slightly taller than her own heigh, and is decorated with red tassels on each end of the shaft.

Personality
As the result of her isolated childhood, Ririchiyo harbored a cold and brooding personality. She would inadvertently lash out at others and interacted poorly with people. This was the reason for her decision to move to Ayakashi Kan: she wanted to live on her own. Her plan, however, is disrupted by the arrival of Soushi, who unexpectedly enters her life. At first, she is initially surprised and uninterested by his offer to form a contract with her, but after his persuasion that his one duty in life was to serve her, she creates a true connection with him, and he becomes her Secret Service agent in the process.

All her life she had been respected merely for her family or social status, yet because of his genuine kindness and services towards her, Soushi was the only one to take interest in her for who she was. Though she continued to treat him with some (unintended) bitterness, she began to warm up to Soushi, and eventually those around her as well. Over time, she came to see her friends as an almost family, and although her slight abrasive nature remained, she reached out to people more in attempt to better understand them.

During this course of her inner development, as Ririchiyo spent more time around Soushi, she found that she was falling in love with him. Although she internally denied this and was confused by her increased heart rate whenever she was around him, she at last admitted her feelings to him. This shows that the icy, impersonal girl she once was had been replaced by a kinder young woman.

Abilities
Ririchiyo uses a naginata in battle whenever she's in her Youkai form.

Trivia

 * Ririchiyo's favorite song is a classical piece called "Comme au Premier Jour" by André Gagnon.
 * Ririchiyo has a younger sister.
 * Ririchiyo favorite drinks are tea and coffee.
 * According to the Official Guidebook (Volume 0), in response to a question about whether Ririchiyo likes high places or not, she answers by saying that she likes relatively high places but isn't very good with roller coasters.
 * The mask Ririchiyo carries in her youkai form is called Hannya, a mask used in Noh theater that represenst a jealous female demon.
 * The Hannya mask is said to be evil and dangerous, but also sorrowful and tormented, which may be in reference to Ririchiyo's true personality, as well the complexity of human emotions. From front, the mask appears frightening and angry; when tilted slightly down, the face of the demon appears to be sorrowful, as though crying.
 * Ririchiyo's preference in clothing color is sise black, white, grey, blue, and brown.
 * Ririchiyo is a tsushun, not a tsundere because unlike a tsundere she regrets insulting or looking down on people and often falls into depression.