And why would this have to translate into Smash?
Suppose that Anna would be a trickster anyway, and doomed to use a sharpened stick. Why would she have to fight like Marth? Make her twirl, make her bounce around! She's a bloody trickster, not every swords(wo)man of average stature has to fight like Marth! Give her lots of movement in her actions, put a focus on mobility! This is, by the way, without mentioning her insane boss form, which wields a lance and has Aether for some reason.
Still, if I were to make Anna into a playable character, I'd go with hemorrhaging weapons out of hammerspace. It just suits her weird time-space transcending ways better.
Beep! Wrong! Goombas are common mooks, therefore the FE equivalent would be generic foot soldiers.
Nice, so what exactly determines this potential? Why are the Black Knight's moves somehow better than Anna's?
Picture Anna running around with a giant axe, done. It's not supposed to make sense, hell, SHE doesn't make any sense to begin with!