Mr. Green is such a downer...

Yet his expression towards children only shows his inner heart.

I wonder why Craig McCracken included him in only 'one' episode. His hump-like posture emphasizes his often depressed state. But he changes the moment someone is kind towards him.

Perhaps he is sad that he is a monster, yet wishes to live among humans without rejection, suspicions, or persecution - bein that he "is" a monster.

This illustration captures a feeling of Mr. Green. It makes me feel sad too.