My Life as a Merman

My Life as a Merman is a anime series and a sequel to My Bride is a Mermaid

Main

 * Nagasumi Michishio - the main protagonist of the series. Nagasumi is likely the only one in his family who has a clear head, apart from his grandmother. After a freak accident of falling into the water, Sun turned him into a merman which he starts a new life.
 * Sun Michishio - the female, mermaid protagonist of the story, Sun is the daughter of the yakuza Seto Group's boss Gōzaburō Seto. She is a firm believer in the chivalrous spirit of mermaids, and is devoted to her role as Nagasumi's wife. She is also in love with Nagasumi. Since she has yet to become an adult, Sun is unable to completely maintain her human form, and her legs revert to a tail whenever she comes into contact with water. Sun saved Nagasumi and turned him into a merman when he fell into the water.
 * Yuna Michishio - Nagasumi and Sun's only baby daughter.
 * Joe - a anthropomorphic shark.
 * Gilly - a grindylow.
 * Isao - a kappa.
 * Satan - a demon and the ruler of Hell.

Recurring
Nagasumi's Father - Nagasumi's father is always shown as an object of suffering, due to his wife's dying love for him. Whenever his wife shows her interest in Masa, he is shown in a depressed state, like the time she offers Masa her home cooked meal, he is shown coughing on a burger and then subsequently harangued by his boss to get back to work.

Nagasumi's Mother - Nagasumi's mother is the easy going type, and has an interest for Masa, which her husband is not particularly happy about. Current events in her life have caused her interest towards her husband to gradually die out, but overall she loves her family dearly. She also greatly enjoys having Sun and Lunar living with them, treating them like family as well as the "daughters" she never had.

Nagasumi's Grandmother - Nagasumi's grandmother who lives near the Seto Inland Sea. She makes an appearance early in the story and allows Nagasumi to stay at her house during their stay with her.

Gozaburo Seto - a sea dragon who is the boss of the Seto Group. He dotes on his daughter and hates Nagasumi for, as he sees it, trying to steal her away.

Ren Seto - a mermaid who is Sun's mother. She likes to encourage Sun and Nagasumi. The most feared member of the Seto Group she usually tries to keep her husband and any other Seto Group members in check, often handing out extreme forms of punishment if they step out of line and has the final say on all matters.

Masa - a member of the Seto Group and the kendo teacher of Sun. He has an afro and always wearing sunglasses.

Maki - a tiny assassin working for the Seto Group, as well a devoted friend of Sun. She uses a shell to shoot water balls as fast and powerful bullets and has a seemingly unlimited supply of ammunition.

Shark Fujishiro - a member of Seto Group initially summoned by Sun's father during the Michishio family's initial visit to the Seto family home to attack Nagasumi.

Octopus Nakajima - another member of the Seto Group and is actually a giant octopus.

Lunar Edomae - childhood friend and rival of Sun. She has used the powers of her mermaid voice to become an idol singer. She seems to suffer from a superiority complex, and she never passes up an attempt to overshadow Sun.

President Edomae - Lunar's father and leader of the Edomae group (whereas the Seto group's holdings are in business, the Edomae group focuses in construction and real estate). He is two meters (6 ft 7 in) tall and constantly dressed in a black skintight suit.

Amano Edomae - Lunar's mother and Lunar's Papa's wife.

Mawari Zenigata - the childhood friend of Nagasumi, whom she has a crush on, and is the daughter of the chief of police. She takes it upon herself to act as a moderator of social behavior, and often reprimands Nagasumi for his actions.

Chimp - a friend of Nagasumi who is often portrayed as a perverted monkey (a pun on his name; "saru" meaning monkey). He later became Kai Mikawa's "servant" and always protects and helps him when he is in need.

Iina Chiyo - a good friend of Mawari and a meganekko.

Kai Mikawa - the fourteen-year-old son of the head of the multi-million dollar Mikawa Corporation.

Akeno Shiranui - not only a mermaid, but also a "mermaid examiner". She has the responsibility of deporting all the mer-people who fail to qualify as not only resembling humans but also not arousing any suspicion of their true identities; and unlike the other mermaids in the cast, Akeno is capable of suppressing her mermaid transformation, for brief moments, after coming into contact with water, having trained herself to do so.