After the recent buff, AP Nunu mid is the new meta to look out for in patch 10.14 and potentially in the upcoming patches as well.
Before the rework, Nunu had one of the worst kits in League of Legends, he was so unpopular that most of the time he was only picked for trolling or using the Disco Nunu strategy. As a result, to end his misery, Riot Games released a full rework on patch 8.17.
And ever since his rework he was great in the jungle, has a great jungle clear but unfortunately, he never had that overpowered stat in League of Legends. In season 10, most of the patches he had around 50% win rate with around 3% pick rate.
He also didn’t get any changes in season 10 besides that 10.13 buff which seems like a crucial change for him in the current patch 10.14. In patch 10.13, Riot increased his AP ratio from both of his Q and R allowing him to go AP as well.

With the help of this new AP buff, a lot of high Elo players including Lee “Faker” Sang-hyeok has been playing Nunu & Willump in the mid lane going full AP and surprisingly doing well. If we take a look at Faker’s op.gg we can see that he has been spamming Nunu mid and a clip shows how dominant he is with Nunu mid even against other pro players in the soloq.
Full AP Nunu Mid
Although Full AP Nunu mid only has a 49% win rate in the Plat+ Elo and 50% win rate at all rank, his ban rate has gone up which is now 14.1% in Korean Plat+ Elo.
Nunu Mid Build:
Nunu mid players always start with Doran’s Ring and get Dark Seal in the first recall if possible. And Nunu’s core three items are Sorcerer’s Shoes > Hextech Protobelt > Mejai’s Soulstealer. The rest of the items are situational.

Rune:

For the mid lane, Faker always takes Dark Harvest with Cheap Shot, Zombie Ward, and Relentless Hunter. And for the secondary rune, he takes Celerity and Waterwalking.
Summoner spell and Skill Order
Mid Nunu players always take Flash and Ignite as their Summoner spell.

Faker start with his W > Q > E but he max Q first. Nunu Mid’s skill order: Q > E > W.
There’s one flaw in Nunu mid if the match extends that 30min mark his win rate drops quite significantly, so if your playing Nunu mid always try to end the game as soon as possible.