Seth Milchick is one of Severance's "most important characters" according to the showrunner, but originally he was a bit part until Tramell Tillman showed up
Title exaggerates it a bit: the character was not necessarily minor, they made it open ended from the start so they could decide later if it would be a character worth expanding or not.
Title exaggerates it a bit: the character was not necessarily minor, they made it open ended from the start so they could decide later if it would be a character worth expanding or not.