Defensive champions

And what I mean by that are champions that have very good survivability and are hard to move from one location. I currently main Heimerdinger mid and I just love the slow push (I play hiding behind my turrets slowly pushing up behind minions I usually dont destroy turrets the minions do) and the rage of some people trying to get past my impentrable defense. I was wondering if there were any more champs like that. I was looking at Azir and his sand soldiers as one Option