Gnar! New meta!
Something I really like is that Gnar is the very first attack damage / physical damage support and adds a whole new spin on the game in this way.
I still think he can work in the jungle as well, but I really enjoy playing him as a support and is champion and role that I am, personally, going to master.
Despite Riot initial intentions of wanting him to be a top lane, and without going to majour details about it, Gnar loses to bruisers and mages (the top lane meta, which will not change, only champion picks will change) he might do well against weak early game super tanks like Mundo and Maokai especially if you max Hyper first for the % damage, but only being able to do well in two match-ups out of every other possible choice is not good.
Another point I noticed is that Gnar can do extremely well with no items (better with tank items) so he can do well as a support with low income and get support items / tanky variations of support items and Gnar can harrass well and Hulk Gnar has super high utility / CC to his kit as well as being innately tanky and slightly bursty. Plus as a support it doesn't matter you are extremely tanky since you are a support, nor have to do high damage cause you are a support so this factor also favours support Gnar as long as he can do support things like protecting your damage dealers and granting vision and de-vision.
This is all I want to say for now: Have a nice day! ~ Stacona