Adding on to ClassicDrogn's recommendation, "Sonata and Fugue"'s author is actually basing the characterisations of the cast on official artwork - because the manga volumes had a ton of splash images portraying the characters in ways that never materialised in canon. Specifically, showing (pre-timeskip) Sakura with large melee weapons, Sasuke playing a flute, Naruto carrying scrolls and brushes, and so on. It's not just fighting styles; there's also certain personality cues that the fic's author is extrapolating from those promo images. This amuses me immensely, I think it's quite a brilliant concept for fanfiction.
-- Acyl
-- Acyl