The father of Hitagi Senjougahara. He is often working due to being in debt after he and Hitagi's mother split. Upon noticing that Hitagi is more cheerful after being with Koyomi Araragi, he is happy that she is able to enjoy herself once again and thankful for Koyomi.

First season of the Monogatari Series, part 1/6. Contains the arcs Hitagi Crab, Mayoi Snail, Suruga Monkey, Nadeko Snake, and Tsubasa Cat from the Bakemonogatari light novels. 
Thanks to Meme Oshino, Koyomi Araragi, a high school student, is able to remain a human after coming across a female vampire... However, since the incident, Koyomi seems to meet girls who have an apparition-related issue. Hitagi Senjougahara doesn’t weigh anything, Suruga Kanbaru’s right arm becomes like that of a monkey’s, and a young girl, Mayoi, cannot find her way home no matter how many times she tries. Koyomi, a Mr. Nice Guy, ends up helping each and every girl solve her problem with the help of Meme Oshino.
 
(Source: Aniplex)

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Second season of the Monogatari Series, part 1/2. Contains the arcs Tsubasa Tiger, Mayoi Jiangshi, Nadeko Medusa, Shinobu Time, and Hitagi End, from the Nekomonogatari White, Kabukimonogatari, Otorimonogatari, Onimonogatari and Koimonogatari light novels, respectively.
 
These stories take place after the end of the summer vacation when the apparition of the bee had left and the apparition of the phoenix avoided any consequences… Now that Koyomi Araragi and the girls were entering their new school terms, they were once again about to encounter supernatural beings…but this time, they may not be so easy to deal with.
 
Tsubasa Hanekawa, Mayoi Hachikuji, Nadeko Sengoku, Shinobu Oshino, and finally Hitagi Senjougahara. The girls’ loneliness, their confessions, and their departures… 5 new “stories” begin now.
 
(Source: Aniplex) 
 
Notes:
 
 Includes 3 recap episodes from the TV version (Ep. 6, 11, 16).
 
The recap episodes were not included in the Blu-Ray version of the anime.

Senjougahara no Chichi