New Class Idea
Clone
Units

They each have 1 of their own Classes, Neeko being a Wild, Shaco being an Assassin and Leblance being a Sorcerer but their secondary class gives them the ability to "Clone" another class that you already own, have 3 knights and need another one who's also a Sorcerer? Find Leblance, have 5 Assassins but need 1 more Void to finish your Void Assassin build, play Shaco, and so on.
Side Note: I just want Neeko in this gamemode, there's a lot of potential with her Passive going on here.