This category should contain character versions that use custom sprites that do not originate from any source media. The sprites don't have to be created by the character author themselves, meaning they could have been created by someone else. Please note that this category pertains to the actual character's sprites, not the sprites for its assists or effects.
Characters that use sprites from a video game or other media should use the Characters with sourced sprites category instead.
Characters that use sprites that are edits of another character's sprites should go in the Sprite edits category, regardless of whether the original sprites were custom or sourced.
Characters with sprites that used sourced sprites as a base (meaning the sourced sprite has been redrawn or gauged to create an entirely new sprite) should go in both this and the Characters with sourced sprites category.