A trend I've noticed with Champions as of late
They break previously-conceived, "set-in-stone" notions of how gameplay works, and that fills me with a sort of wonder and confidence. I always want to see what's around the next corner. Say what you will of their respective balance, they are breaking ground. These ideas might've been labeled off as "improbable" or been ridiculed before their respective releases; you can at least respect that, even if you think they're unbalanced.
Tentacles and or tool for a juggernaut to reliably combat flighty opponents.
An Innate Ability that can be activated at the click of a button instead of it just "always working".
Grey health from Fighting Genre and or set a new precedent for powerful single target lock-downs as basic abilities.
Allows Champions to bypass terrain.
Tunnel system and Tremor Sense.
Can dash on basic attacks.
Can raise albeit temporary full blown turrets.
Has an "uncontrollable" resource.
Allows teammates to apply crowd control they might not otherwise have access to.
who requires you to pretty much play the game backwards.

Attack speed?
RIP mobility creep.
His autos don't belong to this game.
"Resource" and 3 "items" exclusive to him.
seeds
, one of the oldest champions in the game, had only just been released today.
's ult minigame?