This is a list of characters for Tite Kubo's manga and anime series Bleach. It takes place in a fictional universe in which the characters are split into various factionalized fictional races. They are subdivisions of humanity, but are distinguished by whether they live on Earth or in one of the afterlives, by possession of thematically contrasting supernatural powers, and by the use of aesthetics drawn from the artistic traditions of different real-life regions.

The main character of the series, Ichigo Kurosaki, has the ability to interact with ghosts. He soon meets Rukia Kuchiki, a female Soul Reaper from the Soul Society whose mission is to deal with hungering lost souls called Hollows. After seeing Rukia grievously wounded by a Hollow in his presence, Ichigo receives the power of exorcism and psychopompy to carry out her Soul Reaper duties as she recovers. As Ichigo guides the recently deceased to the afterlife while contending with Hollows, he clashes and forms alliances with the other supernaturally powered residents of the city, including his friends.

Many individual characters and the series' character design work have been praised, though Bleach's constantly-expanding character roster has been a point of criticism in the press. The size of the cast has been explained by author Kubo as the result of his writing process, in which he first creates new figures, then writes their personalities and character arcs, and finally assembles these interactions into a new plot. The overall response to this technique is mixed, with some reviewers believing the resulting characters are still relatively stereotypical and often get little individual focus, while others have remarked that even secondary characters feel like protagonists of their very own stories.

Bleach's creative process is focused around character design. When writing plotlines or having difficulties generating new material, Tite Kubo begins by thinking of new characters, often en masse, and rereading previous volumes of Bleach. Kubo has said that he likes creating characters with outward appearances that do not match their true nature, an element that can be found in many Bleach characters, as he is "attracted to people with that seeming contradiction", and finds an "urge to draw people like that when [he] works." When creating characters for the manga, Kubo first designs character appearances and only then decides what their personalities will be, in reflection of what he drew. When brainstorming character designs, he will go out and draw the faces of real people he sees, a hobby of his dating back to childhood. Kubo considers every character to be unique and wants each of them to have the opportunity for character development in the course of the series. When asked about potentially-romantic relationships between certain characters, Kubo states that he "doesn't want to turn the series into a love story", since he thinks there are more exciting aspects of their personalities to draw out.

Kubo has cited influences for elements of Bleach ranging from other manga series to music, foreign language, architecture, and film. He attributes his interest in drawing the supernatural and monsters to Shigeru Mizuki's Ge Ge Ge no Kitaro and Bleach's focus on unique weaponry and battle scenes to Masami Kurumada's Saint Seiya, both manga Kubo enjoyed as a boy. Bleach was first conceived from Kubo's desire to draw a shinigami in a kimono, which formed the basis for the design of the Soul Reapers. Several characteristics from them such as the kidō spells and the zanpakutō swords(katana) are also based on Japanese literature. Rukia Kuchiki was the first character Kubo designed, but he did not see her as a lead character, so he created Ichigo Kurosaki to be the series protagonist. Other characters from the series also use different languages to describe their terminology; the powers from the Quincy are taken from German, while Hollows and Arrancar instead use Spanish terms; for the latter, Kubo believed that the language sounded "bewitching" and "mellow" and that felt appropriate for a species of ghost. The names of several Arrancar are based on famous architects and designers who inspired scenery appearing in Bleach.

Ichigo Kurosaki (黒崎 一護, Kurosaki Ichigo) is the main protagonist of the series. A tall orange-haired high school student, Ichigo becomes a "Substitute Soul Reaper" after unintentionally absorbing most of Rukia Kuchiki's powers. His cynical nature at first makes him ill-disposed towards the duty, but, with the passage of time, he accepts and welcomes the strength his Soul Reaper powers give him. When creating the manga series, Kubo commented that Rukia Kuchiki, the first character he created, did not seem like a lead character, so he created Ichigo to be the series main protagonist.

Ichigo is voiced by Masakazu Morita in the Japanese version of the anime and by Johnny Yong Bosch in the English dub.

Rukia Kuchiki (朽木 ルキア, Kuchiki Rukia) is a Soul Reaper,(死神, Shinigami, literally 'Death God'), who is assigned hollow extermination duties in Karakura Town. She meets Ichigo for the first time when she breaks into his house, not knowing that he can see her. Their relationship further complicates when Rukia saves Ichigo and transfers her powers to him. Rukia lacks it and cannot return to the Soul Society. She assumes a temporary lifestyle as a regular human, using a gigai (human form) obtained from Kisuke Urahara's shop, and enrolls into Ichigo's high school and takes up residence in his closet, while teaching him how to be a Substitute Soul Reaper in her place. Rukia was the first female character of the series created by Kubo, her design being the one he decided to use for all the other Soul Reapers.