Nikki Tilroe, renowned for portraying the Mime Lady on Today's Special, was a versatile utility player on the show. She performed various roles, from additional puppet characters to providing voices and embodying large costumes. Notably, she portrayed Wanda Willoby in "Babies" (1984) and "Letters" (1985) and voiced Hazel in "Butterflies" (1984). Tilroe brought life to the magic dragon in the story "Byron the Grump and the Magic Dragon." Her most notable role was inside the Blue Cow costume in "Live on Stage" (1985) and "The Blue Cow" (1986), animating Emily the Blue Cow.

Regrettably, Nikki Tilroe passed away on September 1, 2005, following a battle with liver and kidney ailments, leaving behind a legacy of memorable contributions to the show.