The forum's been kind of slow lately, so the old question: what can Susan and Nanase do? They can fly and create illusions. Dan's said that, and Nanase has done both. In a filler, Nanase turned Sarah half-cat, though I'm not sure that she can do that in-canon. Of course, there's the fairy-doll spell, which, presumably, is in Susan's repetoire as well. (Come to think of it, has Susan ever used her powers? Dan's said she has them, but...)

Regardless, that's just evidence. Can they do TG? If so, why did Susan just stand by in the storyline with Tedd? What about shapeshifting? TP/K? Even full-animal TF, that anathema to the gun?

Well, I can't think of anything more for Nanase.  Susan can use a sword (at least she's been seen with a sword when Ellen was fighting the goo).  And wasn't there a comic about Susan and Nanase going to Europe for a trip and therefore knowing each other previous to the comics story and sharing these powers?  (forgive me as I cannot find that comic!)  So she has them, but I don't believe she has ever used them. 

~Kat~

Susan used the magic to create the sword you mention.

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Six inches of cute brooding war hero.

I believe creating weapons for herself would be one of Susans powers, as demonstrated by the sword she made in the end of "Sister". Her version of the Hammer-skill could also be one, as she seems to have WAY more control over those than others, she even managed to use hammers when Tedd was being harrased, and no girl was involved.

She was also the one who taught Sarah how to use these.

I don`t believe Susan and Nanase has similar powers, and I also think Susan is a little more afraid of her powers, which would explain why she hasn`t used any powerful magics yet.