From Homestar Runner Wiki
Credenza is Marzipan's ficus. He died once when Homestar Runner watered him with Yoo-Hoo while Marzipan was on vacation in Miami. Credenza was brought back when Strong Sad and Marzipan held a séance with the rest of the characters. It appears on the set of Strong Bad's Strong Bad-Type Interview Progrum in pizzaz, Strong Sad's Review Revue in pizza joint and email thunder, and Strong Bad's Folding Chair Dungeon in yes, wrestling. Additionally, it is one of the items up for sale in The Poopsmith and Pom Pom's "Creeping" Silent "Death" Auction in Halloween Fairstival. In Dangeresque 3: The Criminal Projective, Dangeresque puts Credenza in the Brainblow City Shark pond, much to Marzipan's grief. She violently makes Strong Bad go get him.