Karin "Charlie" Kaiser is a trained German puppet builder, writer, as well as a puppeteer who has performed on Sesamstrasse since 1993. Two years prior, she met Kermit Love and Marita Stolze, who connected her to the Studio Hamburg puppet productions Hallo Spencer and shortly after, Sesamstrasse. On Sesamstrasse, she has played both of Tiffy's hands alongside Marita Stolze (1993-2000) and Sabine Falkenberg (2001-2005), and was the first of Feli Filu's three performers (2000-2003). She also played side characters, such as Frida, and others on the show.