In my opinion Ekko is a really fun chanpion to play, having a pretty nice scaling, being op early and also late. He is a bursty assasin, easy to pick up and also safe for blind picking as he doesnt have many counters. He really might be slightly better in jungle, but I enjoy playing him on mid lane more. Another good atribute is that he has his ult which is basically an out of jail card.

Pros:
Scales well
Good wave clear
Good in laning phase
Mobile

Cons:
Not very good mid game
Pretty weak until Lich bane
Almost guaranteed death on CC

If you dont level your ult level 6 the hologram wont show up. Upgrade it when fighting to surprise your enemies.

Your E can cancel the animation of your W and Q. Allowing you to prepare a surprise attack with your W and to deploy your Q faster.

You can go through the mid lane walls with your E, but this requires some practice.

With Rockbelt, Lich Bane and Rabadon's Deathcap your passive can outsmite the 1200 true damage smite.

When maxed, your Q can one shot casters.

Your W gives vision.

PASSIVE
Z-DRIVE RESONANCE
Every third attack or damaging spell on the same target deals bonus magic damage, and grants Ekko a burst of speed if the target is a champion.
Q
TIMEWINDER
Ekko throws a temporal grenade that expands into a time-distortion field upon hitting an enemy champion, slowing and damaging anyone caught inside. After a delay, the grenade rewinds back to Ekko, dealing damage on its return.
W
PARALLEL CONVERGENCE
Ekko's basic attacks deal bonus magic damage to low health enemies. He can cast Parallel Convergence to split the timeline, creating an anomaly after a few seconds that slows enemies caught inside. If Ekko enters the anomaly, he gains shielding and stuns enemies by suspending them in time.
E
PHASE DIVE
Ekko rolls evasively while charging up his Z-Drive. His next attack deals bonus damage and warps reality, teleporting him to his target.
R
CHRONOBREAK
Ekko shatters his timeline, becoming untargetable and rewinding to a more favorable point in time. He returns to whenever he was a few seconds ago, and heals for a percentage of the damage received in that duration. Enemies near his arrival zone take massive damage.