Dang! Your warriors put mine to shame! Most of my entourage lie within the 20-30 levels, with a few below. My highest-leveled characters are Link, Ganondorf, and Impa, who both exceed 30.
I used to have most of the heroes around level 150 before my WiiU external hard drive crashed. After that I have no want to re-level them all. Grinding levels in Hyrule Warriors is not fun. It's so mind numingly boring. So I can't bring myself to do it. A shame really since grinding hero levels is a main part of the game.