Gustav

 GUSTAV  is a caterpillar character from Sesamstrasse, the German co - production of  SESAME STREET .  GUSTAV  is  RUMPEL  ' s pet  caterpillar who also lives in  his   RAIN BARREL .  GUSTAV  is the only character to this day to whom  RUMPEL  shows his  soft - nature d side.

 GUSTAV  doesn ' t speak & was added to the Sesamstrasse cast in the 2000s. He was based on  OSCAR THE GROUCH  ' s pet   WORM ,  SLIMEY .