Cartoon(s) with Sesame Street animated characters

[salemfan]

Here is a skit based on my life:
Characters:
Alligator King's seventh son
Martian Beauty
Ladybug from the Ladybug Picnic(the teacher)
Principal(who could be the principal? In the meantime, how about the Penny Candy Man?)
(Mrs. Ladybug is reading to her kindergarten class)
Person from outside the classroom:Ok, I'd like the Martian Beauty, ???, and ??? to come with me.
Seventh son: Where is the Martian Beauty going? I must find her.
(Seventh son leaves the classroom without Mrs. Ladybug knowing)
Seventh son(peeking in another classroom):Nope, she's not in there.
Mrs. Ladybug(to principal):Hello, seventh son left my classroom. Please notify the police to look for him.
Police Officer:Ah, there you are. So why did you go looking for the Martian Beauty?
Seventh son: Well, I like her and she left my classroom and I had to look up the word, "garret" in the dictionary.
Principal:Here.(hands him a dictionary and the word is looked up)
(Seventh son finds the Martian Beauty back in the classroom)
Mrs. Ladybug:Seventh son! Where have you been? I had to send the police to look for you!
Seventh Son: The Martian Beauty left the room and I went looking for her.
Martian Beauty:I saw police coming to the school. What happened?
What does anybody think of this skit? Anybody have an idea for what male Sesame Street clip character the principal could be?