Just what is Gragas?

Maybe just me and my own incompetence but what is Gragas? I he a tank? is he an assassin? Is he a god damn mage? He has Burst, Sustain, CC, tankiness. I always believed he's a tank but he can also take electrocute and go mid build full ap and boom, he becomes somewhat of an assassin mage thing like Cho'Gath. I he's a tank why are hi ap ratios so high? If he's a damage dealer then why does he have such tanky base stats and a hit box larger than Summoner's Rift? I am quite confused by this. And for those who might think I am trolling or something, no I am 100% serious with this.
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