Let's say ur working at Riot

remove her Q waveclear

then balance her around waveclearing only with W

I would remove the second proc of chain from procing the passive... And if you leave the range of her chains connection, the chain should just break. It can still hit when she tosses out and then jumps back to her original position, but the .5 seconds of duration outside of the length is slightly annoying.

Change the chain so that its maximum tether distance is equal to 2x the distance at which it hit. Make the mark only require .25 seconds to proc. Increase the reverse time on the jump to 3/2.5/2/1.5/1 seconds and increase the damage by 75%. Give the clone actual HP and allow it to be directly controlled (not sure if this is already an option?).

This'll basically nerf the burst in early-game while making it stronger late-game, and make good tether skillshots a must rather than simply dashing directly onto the enemy and using it before immediately teleporting back.

Does this seem reasonable? I feel like it would make intelligent plays more important and more rewarding.

completely remove her make a new champ and slap her name on it (never forget )

I feel like "the deceiver" is the core of the best LeBlanc montage moments. Cases where you mistake the clone for the actual LeBlanc, where you distort back when it's not expected, etc.

I feel like it would be interesting to mix the Trickster's Glass into her kit, but I suspect that would just be yet another use for her ultimate (Ult + Ability does what it currently does, Ult + Click on ally champion/ally icon = mimic them).

Revert the MYMU changes and nerf/increase numbers until ~50% winrate is reached?

(Damage nerfed as needed)

Her passive becomes trickster's glass' active but without the teleport and with global range, with a kindred passive like system, where you click the portrait.

Q is now an aoe you throw on the ground, and if there's an enemy within pickup range, the closest one will pick up the orb and it'll activate after a short delay. Pickup range should be something like Xerath's ult, with similar time to react. After X seconds, the orb disappears. X should be less than the cooldown, already counting the cdr, except maybe with max cdr. If it's not picked up, the orb will activate after the same short delay but will last considerably longer. Mana cost should be low. It essentially becomes a proximity mine. If another activated orb enters its explosion radius (maybe something like lux's E), they'll both explode. The damage stacks when they overlap and it's intended to chunk when that happens. To clarify, the object is visible and untargetable.

W only number changes.

E potentially nerfed a bit in range and/or tether radius to accommodate. E no longer roots, instead pulls and mini stuns (something like 0.2 seconds or so) at the end. Just like with blitz, she can't do pull+flash. Maybe after the pull she gets a short movement speed boost.

R either keep it as it is or make it so you have a clone which you can control with alt and you can swap with it by pressing R, taking its health, mana, cooldowns (it has independent cooldowns), but you can only do it if you haven't taken champion/turret damage in the past 2-3 seconds or so. Low cooldown. Passive isn't lost by swapping and only 1 gets the passive so you can use your passive, swap, and then have your clone gank your lane, lol. It would probably need a leash, though. The sad thing with this change is that you lose Shadow of the Rose, which is a very interesting ability. I mean, there is a way to keep it in, which is to make it so you have to point to your clone or alt+R for the swap ult, and just R somewhere on the map for Shadow of the Rose.

That would make her very true to her title of deceiver, but I'm not sure if the kit would be overloaded or not, though if there's one champ that should have a very complex and difficult kit, it's leblanc. Anyway, just to make things clear, she should only really burst if she can proc a double Q or something like that.

Also, I'd just like to point out that if the kit didn't work out, I'd adjust it accordingly or I'd revert it and try something else.