Fiora's taunt animation is derived from the "salute" in honor duel tradition (retained in sports fencing today); where opponents would raise their swords to each other at the beginning and conclusion of a duel, bout or sparring session.
Her ultimate is comparable to that of Yurnero, the Juggernaut from DotA, which also pays homage to Final Fantasy VII main protagonist Cloud Strife's Ability 'Omnislash'. All three consist of dancing across the battlefield slashing at random targets. Cloud's moves can be seen here (FF7) and here (CGI Movie).
Royal Guard Fiora's splash art is the only one in which she is holding the blades in a left-handed fashion, with the rapier in her left-hand and a parrying dagger (main-gauche) in her right, though the character model for this skin still has her holding the rapier in her right-hand.
In Nightraven Fiora's skin, the rapier's hilt is based on the Italian "Swept Hilt" design.
Though all of Fiora's splash arts show her with a parrying dagger in her off-hand, none of her character models actually have her holding the dagger.
In her original animation for Riposte, Fiora was supposed to use her main-gauche to parry the oncoming enemy attack. This animation was removed due to it commonly having timing issues.
Before the announcing of the skin names, the Royal Guard skin was nicknamed the Musketeer skin and the Nightraven was nicknamed the Zorro skin by the community.
The Nightraven skin had a different character model before the final design and was nicknamed the Armoured skin. In the old character model, the cape was on the opposite shoulder and Fiora had a neck guard.
Headmistress Fiora is a reference to the cliché most commonly occuring in American sitcoms in which a teacher would end up being hugely attractive and would be a flirty icon to either students or parents or other staff.
It was a skin recommended by the community and was released for Harrowing 2012.