She uses a very short sword instead, it can be shortened like Lucina’s Parallel Falchion was shortened to fit Marth’s. She also uses Cinderellion instead of Arsene but all that would have to be changed would be Eiha/Eiagon to Agi/Agidyne, otherwise everything else for her checks out.
I thought Kasumi used a Rapier for some reason. I don't know why I thought that. I only saw a P5R trailer with gameplay of her once so maybe my memory was just acting wonky.
*Looks up Agi/Agidyne*
So a fireball instead of a curse eh? Well I think we just figured out what her main difference as an Echo fighter would be.
Fiora as Elma's echo... I mean look at most other Echoes, they copy their original even if it's not their canon moves. Fiora could at least share Elma's Twin Swords arts, and replace the Gun arts with Drone arts.
Additionally she could also barrow other specials from other characters for her moveset, Chrom does this with Ike so I don’t see why it’d be a problem here.
*Looks up the drones*
I guess if there exist drone arts that would cover moves like Sliding Slinger and Ghost Factory then it all works out. If not then some special moves she could pull from others are bound to have some similarities to some of her arts.
Of course a unique Final Smash shouldn't be the biggest deal in the world. They weren't for Chrom and Ken after all. Though I have thought of a neat idea for a Final Smash she could borrow from another character. Granted it's an idea they'd never go with.
She borrows Robin's Pair-Up, but summons KOS-MOS to attack with her instead of Chrom. Likewise, if KOS-MOS is in there too, then she can summon Mecha Fiora in the same type of attack.
Instead of the name Pair-Up, I'm thinking of calling it X Zone as a reference to KOS-MOS and Fiora's partnership in Project X Zone 2.