Ekko and Gnar are the same champion
First lets look at Ekko's passive. It's a vayne passive that also procs on abilities and gives movespeed. That sounds an awful lot like Gnar's w.
And Ekko's q, a projectile the he throws out that stops after hitting a champ or its max range and returns to him. AKA Gnar q.
And Ekko's w is a huge aoe stun, aka gnar ult. As well as Ekko's ult being a huge aoe nuke; also gnar ult.
Ekko's e is a dash that also gives him range on his next auto. This one is a bit more of a stretch but it's basically gnar's e and his passive put together because his passive gives him a ranged attack sometimes (i.e. when in little gnar).
Give Gnar a mohawk or Ekkos big ears and I wouldn't know which one I'm playing