"Story bible", "show bible", "character bible": they're all the same thing.
(and if you are familiar and are just splitting hairs on terminology, then please disregard the following) it's a document that lays out the premise and characters in a TV show and includes important details. Casting sheet info is culled from this data. Set construction information can begin here too. In animated series this is where they put character concepts and turn arounds if they have 'em. It's a development document that helps communicate the central vision to everyone who is working on the show. It can be used as a pitch document and after production it often gets updated with new facts about the show so there is continuity and a maintained clarity of vision. They're mostly important when you're getting something up and running, or when you're breaking in a new writer.
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"Story bible", "show bible", "character bible": they're all the same thing.
(and if you are familiar and are just splitting hairs on terminology, then please disregard the following) it's a document that lays out the premise and characters in a TV show and includes important details. Casting sheet info is culled from this data. Set construction information can begin here too. In animated series this is where they put character concepts and turn arounds if they have 'em. It's a development document that helps communicate the central vision to everyone who is working on the show. It can be used as a pitch document and after production it often gets updated with new facts about the show so there is continuity and a maintained clarity of vision. They're mostly important when you're getting something up and running, or when you're breaking in a new writer.