TV-Series
Description
Kaito Doumoto is a main character in the anime, a 15-year-old boy known for being a champion surfer and very popular with his peers. Born on November 21, he stands 172 centimeters tall and has ginger hair and brown eyes. His personality is generally easygoing and carefree, often coming across as cheerful despite a difficult childhood. He has a playful and sometimes flirtatious side, which can be misread as perverted, but underneath that, he is shown to be responsible, kind, and deeply caring toward his friends and loved ones.

The foundation of Kaito's story is an event from seven years before the series begins. He was on a cruise ship with his parents, who were famous musicians, when a powerful storm caused the ship to capsize. Kaito was saved from drowning by a mermaid, who was actually the mermaid princess Lucia Nanami, but his adoptive parents perished in the incident. This rescue left a profound impact on him, and he spends much of the early series searching for the mermaid who saved him, unaware that she is the same person as Lucia, a new girl at his school. His motivation is driven by this romanticized memory, and he finds himself torn between his feelings for the mysterious mermaid from his past and his growing affection for the Lucia he knows in the present.

As the series progresses, Kaito's role evolves from a typical love interest into a central figure in the conflict against the antagonists of Panthalassa. It is eventually revealed that Kaito is not an ordinary human; he is a child of the Panthalassa clan and the younger twin brother of Gaito, the primary antagonist. This revelation connects him directly to the main conflict of the story. His key relationships are primarily with Lucia, for whom he is the main love interest, and with his estranged twin brother, Gaito. In the second season, Pure, Kaito suffers a severe accident during a surfing competition in Hawaii, which results in amnesia. He loses his memories of Lucia and his past, leading to a complicated situation where he forms a close bond with a new character, Mikaru, while Lucia struggles to help him remember their shared history.

Kaito possesses several notable abilities. He is a highly talented surfer, considered a champion on the East Coast. Reflecting his upbringing by musician parents, he is also a skilled pianist. However, his most significant power stems from his heritage as a member of the Panthalassa clan. When emotionally charged or when Lucia is in danger, a triangular symbol resembling a trident appears on his forehead. This mark glows and can manifest powers that counteract the abilities of their enemies, the Dark Lovers and others from Panthalassa. This hidden power, linked to his true origins as Gaito's twin, becomes a critical asset in protecting the mermaid princesses.