|Name: Kaito Domoto (堂本 海斗 Dōmoto Kaito)|
|Birthday: November 21|
|Birthplace: Panthalassa Kingdom|
|Species/Race: Panthalassa Clan|
|Hair Color: Ginger|
|Eye Color: Brown|
|Height: 172 cm (5'8")|
|Star Sign: Scorpio|
|Profession: Surfer, Student|
|Favorite Subject: Gym, Math|
|Least Favorite Subject: Social Studies|
|Favorite Color: Blue|
|Favorite Food: Stew|
|Favorite Type of Girls: Low Maintenance Girls|
|Family: Gaito (brother), Makoto (cousin)|
|Best Friend: Unknown|
|Love Interest: Lucia Nanami|
|Voice Actor: Daisuke Kishio|
|Position in the Series: Supporting Character|
Kaito (堂本 海斗 Dōmoto Kaito) is in love with Lucia and is the twin brother of Gaito. He is an orphan because his parents died in a ship when a big storm (caused by Sara when her pearl is out of control) and the ship is rolled by the gigantic waves. These aren't his real parents, as he found out later. He was a child of the Phanthalessa.
He is the twin brother of Gaito. This is because the Phanthalessa indulged their decendent's power into the two twin boys which, when joined, allows power to destroy the world. This is why Aqua Regina seperated Gaito and Kaito. He washed up to shore wrapped in seaweed after a storm and a couple found him. From there they raised him. While Kaito and his parents were on a cruise Sara was angered by Taro abandoning her and she created a big wave that shipwrecked the cruise ship and killed both of Kaito's parents. Fortunately, Lucia saved Kaito and brought him back to shore. He continued to be unconsious so Luchia used her pearl to save him. He was saved. He then raised himself.
His hair is orange-brown a little red and spiky and he has brown eyes. As pointed out, he resembles his brother Gaito. He wears a variety of different clothes on land such as a white jacket and black turtle neck or a red jacket and a white shirt. While surfing he wears a red, black, and slightly yellow wet suit. In water he wears a blue, red, and yellow outfit with a whiteish cape. His school uniform looks like any other male uniform of his school with a white button down shirt and blue pants.
In the original Japanese version he is voiced by Daisuke Kishio (岸尾 だいすけ).
In the Chinese/Mandarin dub he is voiced by Lin Guzhen (林谷珍).
In the Korean dub he is voiced by Byeonhyeonwoo (변현우).
In the Spanish dub he is voiced by Alvaro Navarro.
In the French dub he is voice by Emmanuel Dekoninck
In the Greek dub he is voiced by Yiorwos Mataragas (Γιώργος Ματαράγκας)
In the Italian dub he is voiced by Simone D'Andrea.