Fanart of Nagi. Source
Nagi (凪) is a unisex Japanese name, its meaning is "calm".
Unknown, presumably a school student
Nagi (凪) is the main character of The Red Sea.
Nagi appears to be a boy or guy with short, cyan (bright green-blue), a bit spiky hair and blue eyes. He wears a light blue jacket with a white top underneath it. He also wears (skinny?) blue pants, white socks and black shoes.