
忍野忍
Also known as: Kiss-Shot Acerola-Orion Heart-Under-Blade (キスショット・アセロラオリオン・ハートアンダーブレード), Tekketsu ni shite Nekketsu ni shite Reiketsu no Kyuuketsuki (鉄血にして熱血にして冷血の吸血鬼), The Iron-blooded‚ Hot-blooded‚ Cold-blooded Vampire, Beautiful Princess, Acerola, Laura
A girl who lives with Oshino Meme in an abandoned building. She loves donuts from the Mister Donut chain. At the beginning of Hitagi Crab, she was renamed "Shinobu" by Meme, who suggested that the name Shinobu (忍), comprised of a heart (心) under a blade (刃), matched her original persona.
Description from AniList, spoilers removed.

Bakemonogatari
Supporting · 2009 · TV · ★ 8.2

Nisemonogatari
Main · 2012 · TV · ★ 7.9

Monogatari Series Second Season
Main · 2013 · TV · ★ 8.8

Kizumonogatari Part 1: Tekketsu
Main · 2016 · MOVIE · ★ 8.3

Nekomonogatari Black
Supporting · 2012 · TV · ★ 7.7

Kizumonogatari Part 3: Reiketsu
Main · 2017 · MOVIE · ★ 8.7

Kizumonogatari Part 2: Nekketsu
Main · 2016 · MOVIE · ★ 8.5

Owarimonogatari
Main · 2015 · TV · ★ 8.5

Owarimonogatari Second Season
Supporting · 2017 · TV · ★ 8.9

Hanamonogatari
Background · 2014 · TV · ★ 7.8