From left to right: Alice, Aika, Akari, Alicia, Akira, and Athena.

Aria Company

Akari Mizunashi

 
Voiced by Erino Hazuki (Japanese), Jeong-Sin Wu (Korean), Benedetta Ponticelli (Italian)

The main character. An immigrant from Japan, Manhome who comes to Aqua to become an undine. Normally shown as a very cheerful person. Has a strange tendency to draw supernatural phenomena to her.

Alicia Florence

 
Voiced by Sayaka Ohara (Japanese), Hyeon-Jin Lee (Korean), Elisabetta Spinelli (Italian)

One of the three Water Fairies and the top-ranked undine in Neo-Venezia, Alicia is Akari's tutor. During the story's run, she's the manager of ARIA Company. She's known by the title "Snow White", and is currently the most popular undine in the city.

  • Catch Phrase: "Ara ara" almost always followed by a giggle.
  • Last-Minute Hookup: Gets married in the last chapter/episode with little/no foreshadowing.
  • Onee-Sama: So very much – to all of the apprentices, not just Akari.
  • Romantic Two-Girl Friendship: With Akari
  • Ship Tease: With Akari, most prominently in the Arietta OVA.
  • Stealth Hi Bye: Does this a from time to time, though it usually happens in the later chapters rather than the earlier ones.
  • Yamato Nadeshiko: the traditional sort, which (when linked to the fact that gondoliers in old Venice retired when their apprentices were ready to be full-fledged gondoliers) is about as much warning as we get that she had planned to retire when Akari became a Prima.

Akino Ametsuchi

Voiced by Yoshiko Matsuo (Japanese), Lee Juyeon (Korean)

Better known as Grandma. Legendary Undine and the founder of ARIA Company. Originally she's from Himeya Company, but break off after meeting with President Aria. Currently lives in countryside.

Ai

Voiced by Kaori Mizuhashi (Japanese), Hyeon-Seo An (Korean), Serena Clerici (Italian)

Originally an anime-only character. Ai is Akari's customer in the first episode of the anime (in place of an old man in the equivalent manga story), and serves as the character that Akari corresponds with (in place of her unknown readers in the manga). In the last chapter of the manga, gets Canon Immigrant treatment.

  • Black Eyes of Evil: When Ai threatens to scream that she's being kidnapped if Akari doesn't give her a ride, her brown eyes go all-black, reverting to normal as soon as Akari agrees. It happens again when she press-gangs Aika into the tour.
  • Canon Immigrant
  • Cheerful Child
  • Last-Episode New Character: In the manga.
  • She's All Grown Up: While she doesn't appear to physically grow during the 6 earth years that the series covers, that changes in the epilogue.

Anna

Voiced by Risa Hayamizu (Japanese)

Grandma's apprentice before Alicia. Left the company after Alicia became Prima. Currently has a family.

President Aria Pokoteng

Voiced by Chinami Nishimura (Japanese), Lee Eunjeong (Korean), Federica Valenti (Italian)

ARIA Company's president. Can be considered as a B Side main character. A Martian cat that Akino met, and with whom she founded ARIA Company.

Himeya Company

Aika S. Granzchesta

 
Voiced by Chiwa Saitou (Japanese), Seon-Yeong Park (Korean), Giuliana Atepi (Italian)

Daughter of the owner of Himeya and its heir. Akari's first friend on Aqua. Has a crush on Alicia and later Al.

Akira E. Ferrari

 
Voiced by Junko Minagawa (Japanese), Jeong-Min Bae (Korean), Cinzia Massironi (Italian)

One of the three Water Fairies, Aika's tutor. She's known by the title of "Crimson Rose" for her conversation skill with customers. Tomboyish enough that she can be considered as The Ladette (especially with Akatsuki mistaking her as a boy when they're children).

  • Adult Child: Her rivalry with Alicia can be very petty.
  • Expy: Probably from Senkoh Katori from Amano's earlier work Roman Club, considering that Akira's look when she was a kid is exactly like Senkoh. She might be Senkoh's descendant. That, or she's expy of his sister, Matou, who also appears in Amanchu.
  • Hard Work Hardly Works: Averted hard. The only reason she's able to be one of the Water Fairies is because she works really hard. As she said, she has no notable talents like her friends Alicia or Athena have, so hard work is all she can do to make up for it - to the point where hard work becomes her notable talent.
  • The Ladette: Except the drinking part -- she can barely hold liquor, especially compared to Alicia, who can hold massive amounts.
  • Tall, Dark and Bishoujo: The Poster Girl

Ayumi K. Jasmine

Voiced by Ryoko Shiraishi (Japanese)

One of the trainees that Akari met when she works at Traghetto. Quite a cheerful person.

President Hime M. Granzchesta

Voiced by Kaori Mizuhashi (Japanese)

Himeya's president. A cat from Manhome. Quite aloof. President Aria has a crush on her.

Orange Planet

Alice Carroll

 
Voiced by Ryo Hirohashi (Japanese), Min-Jeong Yeo (Korean), Loretta Di Pisa (Italian)

A trainee for Orange Planet. Is considered to be a prodigy because of her gondola skills despite the fact she is still in middle school when she is recruited. A real Deadpan Snarker.

Athena Glory

Voiced by Tomoko Kawakami (Japanese), Lee Juyeon (Korean), Laura Brambilla (Italian)

One of the three Water Fairies, Alice's tutor. She's known by the title of "Siren" for her beautiful singing voice. Very clumsy (but see below).

Atora Monteverdi

Voiced by Houko Kuwashima (Japanese)

One of the trainees that Akari met when she works at Traghetto. A bit of Yamato Nadeshiko herself.

Anzu Yumeno

Voiced by Kana Asumi (Japanese)

One of the trainees that Akari met when she works at Traghetto. Very shy.

  • Determinator: Has failed the Prima exam several times, but hasn't given up yet.

President Maa

Voiced by Akeno Watanabe (Japanese)

Orange Planet's president. Originally found as a stray by Alice, who picks her up to take care of. Has a habit of biting President Aria's belly.

  • Your Tomcat Is Pregnant: Was thought by Alice to be a male cat until the vet reveals this fact. Without the pregnancy, though.

Other characters

Akatsuki Izumo

Voiced by Hirofumi Nojima (Japanese), Gwang-Ju Jeon (Korean), Maurizio Merluzzo (Italian)

He works in one of the floating islands as a Salamander, controlling weather on the planet. Has a crush on Alicia (who claims to assume instead it's on Akari). Akari's first customer. His older brother, like Alicia, believes Akatsuki is actually interested in Akari.

  • Adult Child
  • Bishounen
  • Japanese Pronouns: At least in the first anime episode, he called himself "ore-sama" when talking to Akari; a translator's note for one of the early manga chapters indicated he again used a very "high-handed" phrasing for "I."
  • Ship Tease: With Akari. He does seem to have a fascination with her hair, specifically the "sideburns" -- on several occasions, his grasping them is how Akari learns he's there.
    • In one of the manga's short "special" chapters, he meets Akari as she's checking horoscopes. At the end of the chapter, he comments that he's impressed because she isn't despairing over her rather downer horoscope -- and then he remembers that his said: "You might, by chance, meet the person of your heart in town. You'll discover and be impressed with an unexpected side of her, and fall deeper in love." Search your feelings, Akatsuki-san; you know it to be true....
  • Stalker with a Crush: Mild version, mind you.

Ayanokohji Udo the 51st

Voiced by Yuji Ueda (Japanese), Ha Seongyong (Korean), Paolo De Santis (Italian)

Better known as Woody, he works as Sylph, an airbike courier delivering goods in a city without streets. Has quite a bad sense of direction.

  • No Sense of Direction: His first appearance has him lose a map and need Akari's help to navigate the city.
  • Transplant: It's either this or he's descended from Ayanokohji Udo from Amano's earlier work Roman Club considering that they have same name, look, and even personality. His courier service is named "Roman Air," and he is "the 51st" to bear the name.

Albert Pitt

Voiced by Akeno Watanabe (Japanese), Hyeon-Seo An (Korean)

Working as a Gnome, people who works in gravity control system underground. Aika has a crush on him. Older than he looks.

Anno Namihei

Voiced by Motomu Kiyokawa (Japanese), So-Hyeong Kim (Korean)

Better known as Mr. Postman, as Akari calls him. Works for the Neo-Venizia post office and gives Akari first trip in gondola. His name is not revealed until near the end of the series.

Cait Sith

Mysterious Mega Neko that appears throughout the work, especially when the supernatural is involved, to Akari especially. Is the King of the Cats of Neo-Venezia, named after the king of the cats of Scottish folklore, and it is strongly suggested he is a guardian spirit of Aqua.