This has been a very fun thing to do. It also has enabled me to create much more interesting characters than I would if you just gave me a sheet of paper and said, "Draw 9 children and two teachers."
As Jake Parker said, "Creativity thrives on constraint" - in this instance having to echo the shape of a character designed from a Greek letter, representing particular maths/science functions (pretty tenuously, I admit)
And here are all they all are. Please ignore the fact that they were drawn separately and the proportions and style don't always match!