User blog comment:Dragonzzilla/Champion Preview: Gnar/@comment-5077844-20140729094122

Well, what we know is that he apparently uses tantrum as a ressource, which indicates that he has a short fuse adn goes apeshit pretty quickly.

Also, some Riot-guy said that his ultimate will be pretty powerful...most of the time. Guess that has something to do with his ressource too, as we've seen that it ahs 3 colours. max rage = max damage I think.

Then again we've also seen that he has a regular form and his monster form.

My guess is, that he will change form depending on his tantrum bar and will gain bonus effects to all his abilities (including ultimate)

Second guess would be some weird shapeshifting ultimate like Swain's wherre you go completely berserk for as long as your tantrum bar has the right color..

Well, guess we can wait a few more days for his official announcement,.