Fiora's Passive suggestion.
I think 
new passive is a bit under-rewarding for the amount of effort it takes to pull off.
Most of the time in order to proc her passive, you would have to go out of your way / position to hit it. Or use your Q skill which has a relatively long CD at early levels, so you wont be able to use it again for an escape or to reproc it. ( It also has a very weird hit box that is not always reliable ). And even if you do proc it, you put yourself in melee range where most other champs can deal = or > dmg to you and still win the trade. Example of this is fighting an enemy laner with good sustain. ( 
,
, 
, being a few examples).
While being a duelist, I can understand the idea behind it. But for what its worth, the reward you gain for successfully outplaying your opponent, seems a bit lack luster. Here are 4 ideas that I think would help her be a lot viable in lane + other areas of the game.
1.) Be able to proc your passive on monsters or large minions ( Can help her sustain in lane when bullied or countered )
or
2.) Increase the amount of HP recovered per hit ( At the moment, it barely undo's the damage from 1 auto attack)
or
3.) Make the base CD of her Q shorter ( 20secs at level 1 seems a bit to harsh for someone who thrives on dueling people )
or
4.) Making your passive invisible to your enemies. ( while this may take away from the idea of her kit. Having your enemy know when they will get it, makes the passive 2x as harder to activate, since 2 people are trying to use her passive, instead of one. )
Of course I don't think all of these ideas should implemented at once, but I think at least any one of them will make her passive a lot more fun to use. Rather then a high risk low reward scenario.
