Her name might be a reference to a Šablóna:W character with the same name. In the beginning of the game, she uses illusions to trick others as well.
LeBlanc's name in French literally means "The White". It could be a reference to the French mathematician Šablóna:W, who used the name M. LeBlanc to attend a university despite women in her times not being allowed to do so.
The reflecton in her classic artwork is slightly different, possibly showing her old/true self, Evaine.
LeBlanc is the only character in the game with an ability that cost 0 mana at rank 3.
Her /joke "For my next trick, I'll make their life bar disappear." is a reference to the common stage magician routine where the performer will make their assistant or some large object "vanish" in front of an audience. It could also be connected to the false leak of her abilities, where her ultimate made her team's life bar disappear for the enemy team.
LeBlanc's lines "Classic misdirection" and "Lying is, like, ninety-five percent of what I do" are likely references to the TV series Šablóna:W.