Hitagi Senjougahara

Hitagi Senjougahara (戦場ヶ原 ひたぎ, Senjōgahara Hitagi) is a tsundere character in the Monogatari series.

Appearance
Hitagi is a beautiful girl with long purple hair (dark brown in the novels), blue eyes and a glamorous figure, although she is also considered a "frail" girl due to her lack of participation in school activities.

She wears the Naoetsu Private High School uniform the usual way while wearing black thigh-highs and can be seen wearing dresses or similar clothing that cover up to her knees.

In later events, she has the sleeves of her uniform rolled up and pinned in place, turning her uniform into a sleeveless blouse and has short hair.

Personality
Hitagi possesses a sharp tongue and can be quite blunt when speaking to others and while doing so she keeps a straight face making her seem quite frightening. This trait of hers makes interacting with her a challenging task, if not impossible, and is something that Araragi discovers first-hand. In spite of this, she is sincere in everything that she says.

She calls herself a tsundere (but she is more of a kuudere) and probably has some understanding of otaku culture, as she once mentions how "moe" Meme's name was to Araragi. She claims that due to her "high strung" nature she is generally a light sleeper. She also seems to have an aversion to kids.

After the events in Tsukihi Phoenix, she overcame all of her trauma and finally became a completely normal and cheerful girl, chuckling at small things although her sharp tongue is still present, only toned down. She claims that she has the Electra complex and so, would be too excited to sleep in her father's futon.

Trivia

 * The name Hitagi is said to be a related to the term "public works". In fact, the only way to write Hitagi's name using kanji is through "肥田木", which are the kanji for "fertilizer", "field" and "tree" respectively. Meanwhile, the term "public works" is written in kanji as "土木", which are the kanji for "soil" and "tree" respectively. But since Hitagi's name is written using hiragana, this is quite irrelevant.
 * Hitagi's surname Senjougahara means "battlefield" in general, but it can also mean a certain mythical battlefield between the gods of Mt. Nantai and those of Mt. Akagi (Source: here).
 * Light novel artwork depicts Hitagi with brown hair, unlike the TV series which has her sporting purple hair. It's worth noting that some scenes in the TV series still show her with dark brownish or black hair, though this is mostly during color palette changes in Bakemonogatari.
 * Hitagi's blood type is O.
 * Hitagi weighs 45 kg based on her body measurements, but was only 5 kg when she was under the influence of the heavy crab, meaning she wasn't literally "weightless", but rather "weighed less."
 * Hitagi was born on July 7th, making her sun sign Cancer, the crab.
 * Her signature weapon, a stapler, is meant to resemble a crab's claws.