 If you liked
Hetalia Axis Powers
|
 ...then you might like
Free!
|
Well, it's kinda easy.
-They both have a cast mostly comprised by males.
-They both have bishōnens and bishōjos
-They both have ships who aren't technically canon but still...
-They both are very popular amongst shippers
-They both are very colourful
You get the point.
Free! has a bit more drama and it's mainly about sports while Hetalia it's more of a 'history' anime and it's 90% (weird) comedy. They both are lovely, really.