A melee/ranged team
Too many/few melee's? Too many/few ranged?
Now with Gnar released, it is finally possible to have a 5 melee/5 ranged team. Elise, Jayce, Nidalee, Gnar, and Kayle. Admittedly, Gnar and Kayle are both technicalities; Gnar doesn't choose when to switch one from the other and Kayle may as well be ranged for how she's used... but still!!!
I wonder if it could work. Technically every position can be filled by one or more of these folks. Would be fun to try...