This is a tough one: "30 Rock" is a first-ballot Hall of Fame sitcom, and Kristen Schaal has been a comedy delight on everything from "Flight of the Conchords" to "What We Do in the Shadows".

But for some reason, when she joined the cast in Season 6 as deranged NBC page Hazel Wassername, it just… didn’t work. At all. Her unhealthy obsession with Liz was more unsettling than funny, and her arrival goes down as one of the show’s rare misfires.

https://tvline.com/lists/worst-tv-characters-cast-additions-the-office-buffy-gilmore-girls/worst-tv-characters-late-additions-hazel-wassername-30-rock/