Saizaki, Mitome

Mitome Saizaki is a werewolf who works at the Hearsay Police Department with Koyomi Araragi as an adult. Mitome is a descendant of an ancient wolf clan. She can control her transformations, has a great sense of smell, excels at battling, and is even stronger mentally.

[Spoiler] At one point, she worked as the body guard of Tsubasa Hanekawa. [/Spoiler]

(Source: Bakemonogatari Wikia)