If you liked
Fairy Tail
|
...then you might like
Nanatsu no Taizai
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The characters in both are very similar, the main characters in Nanastu could be easily be aligned with those in Fairy Tail-- Meliodas and Natsu, Elizabeth and Lucy, and Hawk and Happy. Both pretty much have the same concept of the characters meeting each other and then set off on a journey (although Nanastu has more of an actual goal whereas Fairy Tail doesnt not have the characters set off to achieve one specific goal throughout the series). Both have epic fighting scenes that will get you excited and pumped up.
If you liked
Ao no Exorcist
|
...then you might like
K
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The overall concept of both is a normal, average boy turns out to have hidden powers, as well as, a back story they never knew of, or had forgotten about. Both set out to fight the antagonist from the world in which they really belong to, with the help of their friends and allies.
If you liked
Shingeki no Kyojin
|
...then you might like
Black Bullet
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Both take place mostly within protective walls that keep their predators out. The main complication in both animes is that the walls are broken and the characters must fight to defend humanity against their predators. In other words, both have their main defense against creatures that have been preying upon them broke down and they must fight against them in order to save humanity.