There’s value in planning out a television show in advance, to know where it’s going and how the characters will develop, but there’s also value in knowing when to adjust those plans. Every show requires an intangible chemistry within the cast that makes the series click, but that’s doubly true for sitcoms. Even if everyone in the original cast is hitting their marks perfectly, finding a supporting character who elevates the show is worth making room for immediately.

For shows like Parks and Recreation and Family Matters , surprising performances from small characters would go on to influence the show in unforeseen but transformative ways. The following sitcom characters were never supposed to last as long as they did , but audiences are surely grateful that they did. These

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