Nisemonogatari

Koyomi Araragi

Koyomi is the lead character of the series and every arc revolves around his interactions with various people. He is a half-vampire, half-human high school student who constantly finds himself having to solve supernatural phenomenon. He has two sisters, Karen and Tsukihi, is dating Hitagi Senjogahara, and has a bevy of other females after him as well. He is generally helpful to others and can be kind when he wants to, but struggles with bouts of pedophelia and often succombs to incestuous desires.

Karen Araragi

Karen is the eldest of Koyomi's two middle-school age sisters. She has a very outgoing personality and a high interest in sports, martial arts, and other athletic activities. While she isn't the brightest bulb in the box, she has a strong sense of justice and feels called to protect others from those who would do them harm. Along with her sister Tsukihi, the two brand themselves as the Fire Sisters and help out those in need. Like her sister, Karen falls victim to both supernatural phenomenon and the incestuous advances of her brother, although, unlike her sister, Karen seems to enjoy the attention her brother pays her.