Hokuto no Ken 2

Both animes has a variation of killings and violence throughout the anime, main characters can eliminate anyone with one attack: -Akame can kill anything with one cut -Kenshiro can kill anything with one finger 

Both are sequels to long running shonen anime who held a huge influence in the 1980's. Sadly, both series have the same problems of continuity errors involving the origins of our leading heroes; Kinnikuman & Kenshiro. The strengths of these sequels are their increased budget of animation, less censored violence, manly heroics and a tearjerker farewell. 

Lots of retroactive continuity, which just turns out to be awesome. Lutz's gun nomenclature now extends to 1,700 year old guns? Ken has a secret past on an island FULL of badasses? Hell yes.