 If you liked
Seto no Hanayome
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 ...then you might like
Kannagi
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Change the gods in Kannagi into mermaids, add a serious 'chivalry' obsession to Nagi, and you've got Seto no Hanayome. They are both hilariously wacky, have amazing character designs, and have very similar character personalities. There's the childhood friend, the bipolar idol, the crazily cute main, and other personalities you'll find in both animes. If you've seen one, I recommend watching the other right away!