what thing currently begs a counter?
Sleepy Trouble Bubble and Paddle Star
Bubble should either not be a trap when missed or not extend through walls, pick your poison. It shouldn't give free extra damage either.
Paddle Star needs an indicator, similar to Jinx W.
what champion skill needs an update?
Cho E, maybe make it something similar to Varus E?
what champion is over/underused?
Overused champs are only overused because they are well designed, I wouldn't call that a fault.
Underused because kit: Anivia, Kayle, Yorick (still), Mordekaiser (still), Shyvana, Zilean (except in pro), Volibear, TF
Underused but beacuse of viability (played when good, ignored when not): Azir, Ivern, Amumu, Corki, Diana, Fiddlesticks, Kalista, Nautilus, Quinn, Taric, Zyra, Skarner, Kog
what type of champions the game is swarming/lacking?
Swarming: Midlaners in general
Lacking: ADC (I don't think bringing over mid laners and top laners to bot fixes the lack of diversity in the lane, I believe just making more cool champs designed for the lane fixes that), Siege champs
what item is over/underused?
"Overused" items are just core items, I think they are necessary to have in the game.
Underused because design: Hextech GLP, Ohmwrecker, Twin Shadows
Underused because viability: ZZ, Wit's End, Nashor's Tooth, Guinsoo's
what game mechanic is over/underused?
I'd like to see more "Lock on" abilities like Vi ult or Kled ult and less unique CC like Irelia's Disarm, Zoe's Sleepy / Sleep, or Ornn's Brittle (though Brittle is sick)