I can give you one example - Unicode Table. For others, just search the App Store for Unicode.
In Numbers on my Mac, I created a document that only contained one text box, with a couple words, one of which was superscript and one of which was subscript.
I imported that to Numbers on my iPod, and I was able to copy the style from that text and apply it to other characters, in other text boxes. I don't have Pages for iOS, but I imagine the same technique would work in that.