Ekko

Strengths

Chronobreak is a potent escape tool, but it can also be quite powerful when used offensively. Don't underestimate its damage potential.
If you can proc Z-Drive Resonance on an enemy champion, it's worth taking risks to do so. The bonus Move Speed makes it easy to escape.
Phase Dive's dash is a great tool for setting up Ekko's other abilities. Use it to get double hits with Timewinder or get into position to detonate Parallel Convergence.

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.
Ultimate · 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.

A suggested 5-lane lineup built around Ekko, based on hero partnerships and role synergy — not win rate.