Welcome to my first submitted build. I came up with this just today. I prefer ekko in the top lane over the mid, as he doesn't do enough damage early enough to combat most mid laners with the current meta.

Ekko's playstyle is simple:
timewinder
phase dive
run away.

seriously you will consistently be damaging your opponent. when your opponent gets low enough or chases too far drop your convergence in his path and he will either disengage to escape the stun/slow and if your opponent gets caught in it you can re-engage in the area and stun+gain a shield for you to continue running away.

Remember that you will be engaging and re-engaging constantly, never stay too long Ekko's stats make him squishy but his kit allows him to fight all the time and take little damage with the long range engage with phase dive and the speed buff that comes from it helps.