LeBlanc Combos?
Solution 1:
Basically every combo is viable but you have to know when to use it.
Damage
The most basic combo is straightforward damage:
Q -> R -> W -> E -> (Q)
This will bring the highest amount of damage within a short time on a target. The second instance of your Q will get triggered by the imitated ability while the second instance of your R gets triggered by either W or E.
(Q) -> W -> R -> (E)
This is basically just for the maximum amount of AOE Damage. You can bring in some other spells for more focus damage but in general this is a great way to clear waves and to teamfight against a stacked team.
Q -> E/R
Basically an easy harass against someone who could stun and kill you. Also really good to use if you need to save your Jump for a potential jungle gank.
Utility
(W) -> (Q) -> E -> R
Leblanc actually has pretty nice CC and catching potential with this combo. You can slow + snare two targets like this. Just always make sure that you use it on two targets. If you just want to chase down a single target it's better to go for:
(W) -> E -> Q -> R
Mobility
W -> R -> (W) -> (R)
This combo makes LeBlanc the Juke-Queen. You can use this combo cover huge distances while also being able to re-teleport back to your starting point. You can confuse People easily, especially if you are teleporting out of a bush.
A general thing to say for the mobility part: Use Q only if you have the time for it. Usually E is stronger since you either want to chase down or get away from an enemy. Q has a casttime and is a distance loss if cast in the wrong moment.