Gragras, most people underestimate him for being a fatty-*** but no he will freaking sit on you until your guts explode. You DO NOT CALL HIM FAT!
Enjoy the guide
PS. Sit on Twisted Fate for me please :3 he luvs to be sat on.

This build will teach you the art of SitJitsu.
So Listen.

Pros:
Heals Himself
Good Damage
Durable
Tanky
No need for Potions Mid-Game to Late-Game
Fluffy and cute
Cons:
Fat
Large
Drunk
Insulted for being a fat boii
Underestimated

Gragras' Passive will be very helpful Mid-Game to Late-Game and you will have more of a SC
(Survival Chance). Everytime you use a skill you regenerate health/heal this stacks with the runes i was talking about earlier in the higher section ^.
Using this healing ability, W(Not really healing just Mana Pot, Doesn't really heal its his passive). It is very helpful so you dont need to go B much and can save lots of money. Also you wont get underlevel

Start Out with Dorans Ring it provides mana regen, and health going up to that tanky/beastly type. Get 2 If nessicary, Cheap way to get health and mana. Get some health pots depends if you really want them or if you can live off of ur passive/Drunken Rage
Move onto Force of Nature
This item is VERY helpful to gragas due to the health regen and movement speed >.> wat? hes slow dont judge meanie.
Warmogs will make him tankier
you may choose between warmogs or rylai's rod because both make him tankier,
Shurleyas Provide a quick escape/chase and more health
And a lil ap for graggy last 2 items (Archangels & Rabadons)

Goodluck me and gragas are going to the bar ^-^