Okay I main Gnar, and I'd like to give you a few counter tips.
Mini Q - This only damages you ONCE. Additionally, after the first target struck, it will only move about a teemo and half further, so standing behind minions helps to dodge this. He also has to move to catch it, or it is placed on a crazy cooldown. It's kinda like aim where draven needs to catch his axes.
Mega Q - This projectile has a significant cast time, and is easy to dodge as long as you aren't just bad at dodging.
Mini W - A good Gnar looks to AA Q AA to proc this. It does magic damage after he gets three stacks, so an early
can help against this, thanks to the passive. Unless he's going all-in, he's just looking to trade. The enhanced regen for a few seconds helps you come on top. It also builds into
/
, which are both good tank items.
Mega W - This ability is hard to dodge. I try to juke it out before engaging him. However, if you find he is slamming a fist into your face, dodge sideways, not back. Another option is to try and stand sort of behind his hand so that you are inside his character. This will cause him to toss the Mega Q right past you.
Mini E - This is a MASSIVE attack speed steroid. Be careful if he initiates a fight with this.
is a good defensive option so that his Mini W does not have as much of an effect.
Mega E - This is his primary initiation tool in teamfights. Play passive when you know he has this available.
Mini R - This is just a passive to lower the cooldown on Q if he catches it and it also increases movement speed on W. It's not very significant, however do expect a minor powerspike at level 6/11/16.
Mega R - This is EXTREMELY easy to dodge. The range is about the same as a Darius Q, and it is almost useless if it misses a wall.
General Counter:
That red bar under his health IS NOT HIS MANA!!!!! It is his rage bar. When it goes full, he becomes Mega Gnar. He can also pop E while transforming to do an AoE double bounce into you and throw in his full combo.
He transforms back after 15 seconds, which is VERY short, believe it or not.
Then he gets movement speed for three seconds. After that, he is tired out for FIFTEEN seconds, meaning he won't generate rage, and he is a squishy little yordle.
Finally,
helps with tentacity against Gnar's overloaded CC.
Hope this helps!
(begins kicking himself for sabotaging himself)