Reveal points of weakness for certain champions (Yasuo/Jax/Fiora/Panth etc)

I like to think up of different solutions in terms of balance; rather than just blatantly going "NERF THIS CHAMPION!!! because of X!". So instead let's take a different approach.

I feel that if a champion has the mechanic to be invulnerable or has an ability that is extremely powerful (blocking ultimates, immunity to damage) their champion should be shown as vulnerable via means of a new animation, or information on their health bar's that show enemy players that they are indeed vulnerable.

Here is an example;

Yasuo's animation from having full stacks of steel tempest (Q) is now moved to when wind wall is ready (off cooldown). Note here this change doesn't even do anything; except hide when Yasuo can knock players up; yet still open up this champions vulnerable side (wind wall on cooldown!) -perfectly good pro's and con's that Yasuo MAINS, and opponents can accept. Because now no one really knows if you have the knock up ready!

When Jax has his stun up, he carries his weapon overhead. Again; another change, that doesn't really effect stats, but changes how people interact with this champion. -Keep note that Jax is a champion that receives updates frequently; not all players are hardcore enough to know his stun cooldown(the mains most likely don't know either while in the middle of a teamfight)

Anyways; since this is a forum thread, let's see what other ideas you guy's can come up with. (Kled dual health bar, Ekko's trailing ultimate)

(specifically his lifesteal ability)