Ha ha, I had no idea of the Powerpuff girls connection, but I like it!
I sometimes translate Pali names, because it’s not uncommon that names lean more to the side of descriptive epithets in Pali. In this case, nagaraka means “little city” and I thought it was an odd name. So I wanted to translate it with something comparable.
But why “Townsville” in particular? Well, as it happens, Townsville was the place where where the thought first occurred to me, “I should go to Thailand”, and that set me on my path. So I am always grateful to Townsville and wanted to memorialize it in the Suttas.