Nanami, Lucia

七海るちあ

Mermaid Princess of the North Pacific Ocean, keeper of the pink pearl, and the story's main character. Lucia travels to land to search for a boy she saved seven years ago. She remains unaware of the danger in the marine world and of her true mission until her "older sister," Nikora, informs her. She is defined by her simplicity and naivety, yet possesses a strong will, traits typical of shoujo manga heroines. Her idol form is Pink Pearl Voice. Among all the mermaids in the series, Lucia's mermaid and human forms show the greatest contrast (she has dark blonde hair and brown eyes on the surface, while having lighter blonde hair and light blue eyes at sea).
Some Western fans still spell her name as Luchia, due to a misunderstanding of the spelling systems of different languages. The Italian name Lucia follows Italian spelling rules, which state that "c" is pronounced as a post-alveolar affricate (the same sound written as "ch" in English) when it appears before a front vowel (in this case, "i"). That pronunciation is correctly represented in Japanese kana as るちあ. When attempting to transliterate the kana back into Latin characters, some people, unaware of the Italian spelling of the name, tried using the English "ch" to represent that consonant, resulting in the incorrect spelling "Luchia."