Ekko's early base damage is way too high. Annie comparison inside
This is not balanced in the slightest.
Until later levels where Annie's Ultimate is ranked up more, Ekko's E+Q combo alone does more base damage than her entire burst combo.
Take level 6 for example, if Ekko E's onto someone, and hits them with both hits of Q: Passive: 70 + 80% AP Q: 200 + 70% AP E: 111 + 40% AP 381 + 190% AP. Plus he slows the hell out of you, and gets a crazy movement speed boost to just waltz away. And this isn't counting Corrupting Potion damage either, if he is using it (which he starts with 75% of games)
Annie's Ult+Q+W: Q: 150 + 80% AP W: 70 + 85% AP Ult: 160 + 75% AP 380 + 240% AP
This does not include Tibbers autoattacks, nor does it include Ekko autoattacks after the E. Yes I am aware Annie stuns, etc. however Ekko can do his combo whenever he wants during laning phase, ESPECIALLY top vs a melee. And this isn't utilizing his full kit, it's not counting the % damage from his W or his Ultimate at all. Of course if you include those, his numbers are FAR higher, but that's a bit more situational and my point is only his harass combo is way too strong. Not to mention he can do this before level 6, it's not even like hitting level 6 gives him any more damage than at level 5 anyway. He can easily do this at level 2-5 for slightly reduced damage but the point is that he has Annie-combo levels of damage on TWO abilities not counting any additional autos. God save you if you get hit by his stun, or if he can get his W execute damage or his Ult damage on you. And on top of all of this, he doesn't have to commit to anything not only because this kind of combo by nature lets him just walk away because of the stupid movement speed buff and slow, but because he can always just Ult away whenever to undo whatever you just did to him and/or just nuke you if you are close enough to his ult point. And his ratios aren't even low either obviously.
Anyway this insane base damage is why he is built tank, you don't need to build AP when your simple combo does as much as an Annie ult combo, not counting Sheen/Iceborn, or any later autoattacks, or his W or his Ult. And that is all with so little counterplay for most champions, and with SO much in his kit to fallback on including his 2.25 second stun with his 150% AP ratio shield, and that's not to mention his Ult.. yeah.
But I won't have to deal with him really, since he is banned almost every single game. It is just incredibly annoying on the off chance that the opponent gets him. Hell it's one reason I won't ever play Blind normals, with things like this running around. I'll stick to my draft queues thank you.