Shino Madarame

Shino is one of the Shinigami that replaces Zennosuke Kurumadani as the guardian of the Karakura Town area.

Appearance:
Shino has dark hair and wears a standard Shinigami Shihakusho with a dark piece of fabric sitting on top of her head.

Personality:
She is quite rude and tomboyish. She has a strong personality and expresses her thoughts by yelling. She also tries to drag Ryunosuke out of his shell and keeps telling him he shouldn't be so soft. She is quite sensitive when someone makes a remark about her flat chest and punches the culprit as punishment.

Plot:
The Thousand-Year Blood War arc

On the day they are scheduled to begin guarding Karakura Town, Shino spots Ryunosuke and greets him. Ryunosuke is very sleepy and looks the wrong way, so Shino slaps Ryunosuke. She tells him to get ready to leave to the Human World, but Ryunosuke admits that he is scared. Shino says that he has no reason to be scared, as he is with her, but Ryunosuke is not convinced. She then yells at him, telling him not be a sissy and to have faith in his abilities. She says that he should stick out his chest more, prompting Ryunosuke to jokingly remark that Shino has no chest to stick out. Shino punches him in the face as a result.

The pair arrive in Karakura Town alongside Kurumadani, who leaves them after offering them some encouragement. She tells Ryunosuke to split up: she will go north, while Ryunosuke goes south. While on patrol, Shino is hit by a group of Hollows and is found in their grasp by Ryunosuke.
They were rescued by Kurosaki Ichigo and Shino recovered quickly, but had to wait for Ryunosuke, who took two days to wake up. When he finally did, she seemed relieved, but punished him for taking so long immediately after. When Ivan Azgiaro appears in the room, the pair watch as Ichigo kicks him out of a window, leaving them wondering who Ivan was.

(Source: Bleach Wikia)