Ken Bahn is the sixth student of the seven pupils in Bash Street School's Class IA. He has a keyboard for teeth and he plays them whenever he is in a good mood. He likes to wobble and lean as he walks. When it rains he sings " It's raining raining raining and pouring pouring pouring. It's raining raining raining. It's pouring rain." When his time comes to say goodbye he says "Thank you." When he greets himself he says "Hi. I'm Ken Bahn." then giggles. When he has a cavity on his do re mi tooth he says "I have a cavity right here on my do re mi tooth."
He has a black hat, pink lips, piano key teeth, a red bow tie, a blue dress and black boots.