If you're looking for anime similar to Hetalia: World Series Extra Episodes, you might like these titles.
In the name of keeping global peace, politicians have come up with a new method of sorting out disputes: they meet in locations across the world and wager on a game of Mahjong. Koizumi is the former Prime Minister of Japan’s Cabinet who is not only a Mahjong master, but won't let anything stop him from attending a game – not even three bullets to the chest from hired hitmen! No matter what obstacles appear in his path, be they alien-controlled ministers, weapons of mass destruction hurtling towards Tokyo, or the resurrected form of Chairman Mao, Koizumi will play his best hand, down to the very last tile.
At Cromartie High, it’s tough being a delinquent -- a fact that do-gooder Takashi Kamiyama intimately understands. When he’s not engaging in contests of strength and rival gang wars, Kamiyama can also be found submitting punny jokes and planning his own rise to fame within the delinquents’ ranks, and that’s just the beginning! With friends like robotic Mechazawa, a giant gorilla, a hairy man from the 80s named Freddie and a clan of delinquents with mohawks that flow in the wind, how can anyone not enjoy high school?
Rock Lee is a youth from the Hidden Leaf Village who strives to become a worthwhile ninja - despite the fact that he is unable to use ninjutsu! Alongside fellow teammates Neji and Tenten, Lee must overcome this obstacle while completing a variety of absurd training routines, protecting the village from the always-scheming Orochimaru, and somehow finding time to win over the heart of his beloved Sakura, who rejects his every advance. However, this matters not to the eternally cheerful and energetic boy, who seems to be undeterred by failure of any sort. Whether competing at the annual sports meet, acting as bodyguard for the Hokage, or battling against his friend and rival Naruto, Lee always gives 110% effort, determined to live out his springtime of youth to the fullest!