Myuu

A young girl from the sea people tribe living in the coastal town of Erisen. She is the daughter of Remia from the sea people tribe and is 4 years old. She has emerald green long hair and fan-shaped fin-like ears, with a well-arranged cute face. She speaks with a distinctive "〜nano" at the end of her sentences. She was kidnapped by a human trafficking organization and confined in the town of Fuhren, but managed to escape and was then rescued by Hajime and his group. Later, she was captured again and put up for a secret auction, where Hajime saved her. Initially, she called Hajime "big brother," but Hajime felt awkward being called that and suggested another way to call him. Since she never had a father since birth, she started calling Hajime "Papa." Hajime requested to retract this, but she insisted, and eventually, she started calling him "Papa." Since then, she has adored Hajime like a real father. She always behaves cheerfully but was enduring the loneliness of not having Remia around.

Through a guild request, Hajime and his group accompanied her back to Erisen, where she safely reunited with Remia. After the reunion, Hajime decided it was too dangerous to take her on further travels and planned to part ways after conquering the Melusine underwater ruins, but Myuu sensed the impending separation and clung to Hajime. Finally, Hajime decided to part ways but promised to come back for her and take her and Remia to her homeland, leading to a temporary separation.

However, to lure Hajime to the demon kingdom, both she and Remia were captured by Freed. When Yue was taken and Hajime went on a rampage with conceptual magic, she bravely stood in his way to stop him. Afterwards, she was sheltered under the guise of protection in Oscar's hideout. There, she had several autonomous golems made for her guard, but contrary to Hajime's intentions, they somehow developed egos. After trying to make another one, it also developed a different ego, and this continued until all seven golems had their own egos. These seven golems were named after the seven deadly sins by Myuu herself.

In a side story, Hajime made her simple guns "donnaa" and "shuraa-gen," and she demonstrated a terrifyingly good shooting ability, leading to suspicions that she might actually be related to Hajime by blood.