Who counters Ekko?
Last game I was playing Ziggs vs Ekko. He countered me so hard that I had to take it in the butt multiple times because he had too much mobility and damage.
But let's ask the big question here - who truly counters him? I can imagine squishy ranged casters doing a terrible job vs him because they're squishy, but assassins are also quite poor against him due to his health reset on his R. What about tanks then?
The way I see it is that Ekko is like a combination of Ahri and Fizz with more CC, more mobility, and a "get-out-of-jail-free-card" on his ult.

are good against him.one can avoid the clone,one can supress him and the other two don't even give a damn about his ultimate
Mid as 
also does decently well vs him.
and did pretty well with
. I think any champ with CC will have a better chance. Take
for a spin against him, see how that works out :)
actually counters him since he does counter practically all AP champions. Though with Ekko's ultimate and Galio's lack of "burst" I think you'd need to make sure you hit him with a few Q's before thinking about going all in, or have a jungler come in. However, as far as can easily survive lane against him, I would think Galio would do fine.
i have played against an ekko as yasuo more than 3 times and i rekt him all times soooo ya.