[2019] You can take almost any keystone on Gnar without it being troll

I was thinking about champs who can take the most amount of different runes, specifically keystones, without doing it to try and be a troll. Gnar seemed to stand out and i've also seen people taking many different runes on him, in pro and ranked.

OF COURSE some are better than others but you can still do reasonably well with any, especially in different roles. I think the only one I could think of that wouldn't work is Guardian, because I think it only works if you can cast spells on allies? Do correct me if i'm wrong, can't look it up right now. I think glacial augment can be used with Mallet or Iceborn Gauntlet because that was another one that I pondered over.

There's probably a couple of other champs who are similar, although I haven't thought of any who could use them to the same effect.