Roaming tanks are good. You need a way to quickly push lane and be there for obj. Void Grubs are really good and can easily take tower plates if you can get a kill, and dragon with soul is always a game ender.
For adc, lethality is busted right now. Varus and MF are the top, but draven or ashe are really good pickups.
With 14.2 bringing down the AP mages, I really like where the game is at. All roles feel fair.