My Bride is a Mermaid

Alt title: Seto no Hanayome

If you're looking for manga similar to My Bride is a Mermaid, you might like these titles.

Sore wa Totsuzen, Unmei no Aite ga

Sore wa Totsuzen, Unmei no Aite ga

Imagine a country where couples are chosen based on the compatibility of their genes. Whenever a resident reaches the age of 14, a partner will be suggested to him or her based on which match would result in the best child being born.

I agree

Urusei Yatsura

Urusei Yatsura

Ataru is one of the most desperate womanizers alive, and a man whose life is about to become complicated. When aliens invade, he discovers he has been chosen at random to be mankind’s defender, and must play a game of tag with the beautiful alien princess Lum to decide the fate of the planet! After chasing her with all of his crafty techniques, Ataru finally wins, but his victory also means he must marry the princess herself! Now, with strange alien visitors and a jealous wife to handle, Ataru still manages to keep an eye on his ultimate goal: having his own harem!

I agree

Rizelmine

Rizelmine

In the present, the Japanese government has been conducting experiments to genetically engineer a human: a girl named Rizel. The experiment was a success -- sort of. While healthy and cheerful, 12-year-old Rizel also ended up possessing the uncanny need for “love” to further her development, as well as tears which were in fact volitile explosives! When sadness can end up destroying a city block, what's a girl to do except...  get married?! For Iwari Tomori, the young man chosen as the most appropriate partner for Rizel, life is about to change, for better or for worse!

I agree

Kitsune no Yomeiri

Kitsune no Yomeiri

Ousuke is some random geek who seems to have terrible luck. He wishes for nothing more but to get rid of his terrible luck & to be able to have a normal, peaceful school life, and so he prays for that wish at a fox altar. Upon praying to a fox statue his life seems to take an unexpected turn for the better….or is it for the worse?

I agree

To Love Ru

To Love Ru

Rito was just an ordinary high school student, but that changed the day an alien princess named Lala appeared in his bath tub. Before he knows it, he's engaged to the most important woman in the universe and her jealous suitors are trying to kill him! When Lala decides to enroll at his school, Rito has to survive both attempts on his life and Lala's crazy inventions, and somehow find the time to confess to his real true love, Haruna.

I agree

Pipi-chan

Pipi-chan

The tale of a boy turned into a merman by his father and released into the sea, raised by a turtle, who befriends the daughter of Captain Nemo (who kills the turtle) and a piano playing fish who befriends a talking, underwater car in an attempt to save Nemo’s daughter from her own father because she swallowed a red pearl by becoming a member of his crew…

I agree

School Ningyo

School Ningyo

Rumors tell of mermaids that appear at the school's pool at night. It is said that if you eat their flesh you'll be able to have the person you love - but only if you can see and catch them. Yoshiko and Haruko are on the hunt for the mermaids, having found a notebook that chronicles the ways that previous girls found and ate the mermaids. In the dead of night they say a chant and the mermaids appear - but they aren't quite what was expected...

I agree

Aho-Girl

Aho-Girl

Yoshiko is a hopelessly clueless high school girl. Her rock-paper-scissors strategy is “rock.” She somehow gets zeroes on multiple-choice tests. And she has an often-nearly-fatal weakness for bananas. Her devoted friends have no choice but to hang around and make sure nobody takes advantage of her. (Of course, the entertainment value might have something to do with it, too.) Cute characters, weird gags, and lots and lots of bananas!

I agree

Nichijou: My Ordinary Life

Nichijou: My Ordinary Life

Yuuko, Mio and Mai are regular high school girls who lead a normal everyday life. However, with bizarre explosions causing random objects to rain down on their heads, lunch turning into an epic battle between girl and wiener, and students riding to school on goats, their lives are anything but ordinary. Meanwhile android Nano spends her days wishing she were a normal human, but keeping house for her creator, the playful and immature child genius Hakase, dealing with talking cat Sakamoto, and trying to keep a hold of her multitude of easily-detachable body parts, her dream is far from a reality...

I agree

Hinako's My Wife?!

Hinako's My Wife?!

Tsukiwaka might be a fan of cute and girly things, but actually he can’t handle women well. One day, a strange, beautiful woman named Hinako showed up on his campus. She handed a hand-made lunch box to Tsukiwaka while smiling, “I am your wife.” Since he is bad with women, Tsukiwaka thought he could resist such an unexpected self-declaration, but why does Hinako make his heart race? Should Tsukiwaka go along with her play?

I agree