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Hitagi Senjogahara is Koyomi Araragi's girlfriend and she has a 'tsun-dere' personality (normally is aloof towards a certain person but becomes loving and sweet towards that person in a certain situation), but more like 'tsun-dry' (cool and collected)
But when she is sweet, she becomes totally sweet so she can be 'tsun-doro.' So I don't know what she actually is but that's how charming she is. Senjougahara, 'tore' 「蕩れ」(facinated)! ('more' is a sensitive word, which is the next level of 'moe')
As she is physically weak, she reads books during break time, she skips physical education classes, goes to the doctor often and it's not unusual for her to arrive to school late or leave early.
That was due to the weight loss by Kani's strange act. She had a relationship with him due to her painful past. But she was saved by Koyomi.
She pursues Koyomi as quick as a lightening, she confesses her love towards him few days after he had saved her and she wins his heart.
She is top level in academics and she often helps Koyomi with his studies as he cannot keep up with class.
Don't miss out the dating story in episode 12 of 'Bakemonogatari'. After watching it, you would want to be like this couple. That's how I felt.
I wish I had a 'tsundere' girlfriend like her...