You could say that - she's kinda like one but she doesn't have a tail or anything! She's just a spirit who comes from the water, so it's like she's Water Tribe.

But they say sometimes she takes on a human form, too - like a hero! [He embellishes somewhat, to try to make the Painted Lady thing sound like a legend and like what he's learned superheroes are like at the same time.]</small?