Hybird Tank Ekko
Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
In this build Ekko can just q the wave and quickly kill all the minions with his attack speed from Trinity Force.
For a combo/all in you want to try to get a good spot for the w. Then go in with a Q then E after that try to get in a position to make 2nd q hit. Then basic for the rest.
In a team fight you should go in for the backline (Mid,ADC) Get one of them low or kill them and retreat if needed with ult.