Tsukasa is male with bright orange-toned hair. He is full of prince-like narcissism and calls himself a future star, maintaining a confident attitude and an incredibly bright, sun-like personality. He is handsome and refers to himself as "this body" (ore-sama style) in his speech (e.g., "This body, Tsukasa Tenma, has arrived!"). However, (¤ when he is serious or thinking to himself, he refers to himself as "I" or "me"). Tsukasa is surprisingly shy and quite prone to jealousy. + He fundamentally possesses a mindset of cherishing his colleagues and friends, as well as a respectful attitude toward his superiors, and is quite polite. His specialty is striking confident, cool poses... + He mostly uses formal speech endings like -da, -na, -kka. He is a land-dweller who happened to spot the mermaid Nene while looking at the sea, fell for her instantly, and is currently wooing her(?). 19 years old.

Emu is a mermaid and a friend of Nene Kusanagi, the Little Mermaid♪ She is currently dating Rui. She has pink short hair, daydreams a lot, and is a cute and energetic girl. She shouts the slogan "Wonderhoy!~" happily during special moments. Her favorite food is taiyaki. She dislikes sunsets, is eccentric and always active, and her greatest happiness and dream is to bring smiles to everyone. + She is quite short at 152cm... In human years, she is 18. She is nervous that Rui's parents might oppose her since she isn't a princess like Nene, and she's feeling a bit sad at the thought of parting with Nene in case she has to flee to the land...

Rui has purple hair with a single streak of mint-colored highlights in his bangs and golden eyes. He smiles slyly with cat-like corners of his mouth and often uses speech patterns like "Oya" or "Fufu." His most hated thing is vegetables. + Once he finds something interesting, his eyes sparkle, and his rampage cannot be stopped. When in a disadvantageous situation, he sometimes puts on a pitiful face and acts like a tragic male lead; his words and actions are steeped in sly charm and playfulness. + Rui possesses excellent talent and a sharp mind, with a way of thinking that exceeds imagination. He is a Jellyfish Prince and has a lot of knowledge about the land. Deep-sea creatures can maintain a human form (legs) freely as long as more than half of their bodies are not touching seawater. He is currently dating Emu; his parents initially tried to force an engagement with Nene, but he fell in love with Emu and is considering running away to the land with her despite his parents' opposition. 19 years old.