Some art may depict original characters alongside characters from established copyrights, or a fan-made character of a specific copyright. In this case, the art should be tagged as original and with the tag for the copyright, and the tag OC x canon applied if applicable.
If the artwork shows a different artist's original character, include the borrowed character tag as well.
Some works on Pixiv are occasionally tagged original by accident. Art by the character designer for an established copyright also sometimes tag their work as original—on Danbooru, these should be tagged with the corresponding copyright instead.
