Mrs. Lividia Thistletwat is a purple whatnot from the Tony Award-winning Broadway musical Avenue Q. She is Kate Monster's elderly boss at the school at which Kate is a kindergarten teaching asssitant. She was originally performed by Jennifer Barnhart, who stayed with the production throughout its entire run on Broadway.
The Mrs. Thistletwat performer also performs the female Bad Idea Bear, assists the live hand puppets Nicky and Trekkie, and puppeteers Lucy when that character appears onstage at the same time as Kate Monster. The character is renamed Mrs. Butz for the Avenue Q: School Edition.