Can we talk about LeBlanc for a moment?
Well, of course she isn't that obnoxious anymore, now that her silence got removed some time ago, but that doesn't solve the underlying problem - her extreme saftey and damage despite almost taking no risk. The problem lies pretty much with the W. But simply removing it would pretty much beak the champ completly... But right now LeBlanc pretty much dictates the lane she's in, no matter the matchup. She can't be ganked, decides when to engage into a trade, pokes with extreme safety... all in all just frustrationg to play against.
I mean has Riot finally decided on her theme? If we go by lore she's supposed to be a "trickster/illusion mage", being all about "smoke and mirrors" and confusing the enemy. The passive is right now the only thing that SOMEHOW abides to that fantasy. And no, simply strapping a fancy smoke sfx to the mobility spell doesn't solve it either. Q and E are more like generic mage spells, although the E is a bit more usable than the generic mark-for-combo-skill.
It's not like her theme doesn't have any potential at all. She should be more about using that mirror-image-clone, maybe even having a skill to swap places with the clone without the enemy noticing. Another niche could be illusions in general. How about you create an image of your jungler rushing to your lane to scare your opponent off? Of course the illusion would deal no damage, but it should be enough to cause a lot of confusion - especially if suddenly the real jungler comes at the same time.
Or how about multiple clones? Oh, I'm in trouble? BÄM, NOW THERE'S TEN OF ME! Have luck killing the right one now... This would sound like some super mean ultimate move. Around the enemy several LeBlanc-Clones appear, all of them basic attacking and moving randomly. Just among them is the real one, slowly getting close for the deadly strike...
Vision denial might be a possibility too, depending on how it fits with the rest. My approach would be to make her still able to blow people up, but with less range and with less safety - and with tons of mind games involved. As LeBlanc I want my enemies to wonder: "Is that now the real one or just the clone?" ; "Is that really the enemy jungler or just some trick-image?" , "HA, NOW I GOT Y-" explosion of smoke, Muffled dying scream
I think you get what I'm getting at ^^
for that.