Микару Амаги

Mikaru is the girl who finds Kaito after he had lost his memories. She's a rich, yet desperately lonely girl who has lost all hope. She falls in love with Kaito and is desperate for him to return her feelings to the point that, from Lucia's perspective, he has forgotten his mermaid love completely. Mikaru also seems to be a sickly girl, collapsing to the floor every time Mikeru appears somewhere else or when Kaito is near Lucia (in order to keep Kaito to herself).