Jibblies Painting

From Homestar Runner Wiki

The horrible painting is a creepy drawing that managed to rank as number nine on Strong Bad's bottom 10 list. It has presumably been in Strong Mad's Room since the Brothers Strong were little, and always manages to give Strong Bad the jibblies. The painting itself bears a slight resemblance to the Jhonka. It appears to be some kind of gray gremlin-creature with red eyes sitting on a rock and holding a torch. The painting has a background that fades from blue to green. It lives in the shadows and tries to beckon Strong Bad into the closet by creepily whispering the phrase "Come on in heeeeere."

The link to the Horrible Painting in the weeklies.xml file is "rocoulm", perhaps revealing the creature's name.