How to fix ekko
Stun removed
Instead ekko gains 25% more shield per enemy champion inside of his bubble when he goes in for the shield
This also helps favor more AP in builds because he gets more AP scaling, but he loses the BS stun (still has slows galor)
This in itself will stop tank ekko because he no longer has the means of being a tank in team fights from the loss of the stun (only has slows) so he will focus more on AP to kill targets faster instead of just killing them because they can't react or escape him and his team from the constant stuns
This also makes ekko want to land his bubble on more people for more survival
Also note his shield ratio could be reduced by 50% but the bonus shield effect increased to 50% instead of 25% bonus. Making him require more skill with his bubble to survive in fights
This change would effectively remove tank ekko because he no longer has hard CC, while still maintaining the goal of the spell for keeping ekko from popping due to a massive short duration shield if he lands a 5 man bubble