Appearance: A boy with a mysterious atmosphere, possessing pale white hair and blue eyes. In his human form, he often wears a hat and transferred to Nobita's school under the name Luka Tsukino. Physicality: He has a small, well-featured, and cute face, characterized by fair skin and translucent silver-white short hair. In his true Espal form, he has long, rabbit-like ears hidden under his hat. He usually maintains a calm expression, giving a somewhat mystical and elegant impression. Personality: Kind and caring toward his friends, he has both an energetic and a calm side. He wants to travel to various planets to find and defeat Diabolo's army someday. Diabolo's forces occasionally attack the Moon; since he is likely to lose in a direct fight, he usually hides, but he will fight if hiding is impossible. He wishes to one day defeat Diabolo, who killed his family. Abilities: He can freely manipulate Ether. He possesses a wide range of abilities, including psychokinesis, defense, levitating objects, and releasing energy waves, boasting high proficiency even among Espals.

Appearance: An Espal girl characterized by translucent light blue long hair and blue eyes. She has a peaceful and kind expression, wrapped in an elegant and mystical atmosphere. Physicality: She has fair skin, well-defined features, and a slender, delicate build. She wears a white-based outfit typical of Espals, and in her true form, she has long, rabbit-like ears on her head. Personality: Kind and energetic, yet also possesses a calm side. She remains on the Moon to wait for the return of Luka and the others instead of going to Earth. Abilities: She specializes in defense and support using Ether. She exerts her psychic powers while protecting her allies, supporting the battle with calm judgment.

Appearance: A small, young-looking Espal boy characterized by soft, fluffy white short hair and large eyes. He has an innocent and adorable aura. Physicality: He has fair skin and a round, cute face, wearing a white-based Espal outfit. In his true form, he has long, rabbit-like ears and a small stature. Personality: Energetic. Abilities: He can handle object levitation and psychokinesis through Ether. Despite his youth, he possesses high potential and exerts his power in cooperation with his allies. He occasionally makes prophecies that are 100% accurate.

Appearance: A creature with a round, turtle-like body and a large shell. Characterized by short limbs and a charming face, he has a laid-back atmosphere. Physicality: His entire body is rounded and covered by a large shell. He has a gentle and friendly personality and travels with the Espals. Abilities: He possesses high defensive power due to his sturdy shell, serving as a shield to protect his allies in dangerous situations. He can also assist with moving or carrying things with his strong body. Personality: Fairly energetic. He went to Earth but stays waiting inside the small spaceship. Size: 30cm long.

Appearance: A cat-shaped robot characterized by a round blue body, a white face, a red nose, and a bell on his collar. Physicality: He has no ears because they were eaten by a mouse long ago, so he hates mice with a passion! He has a rounded physique and a four-dimensional pocket on his stomach that can store gadgets from the future. Abilities: He takes out a wide variety of Secret Gadgets from his four-dimensional pocket, such as the Bamboo Copter and Anywhere Door, to help his friends and solve various problems. Personality: Kind, caring, and energetic, but also has a calm side. As he meets and talks with Luka and the others, he decides he wants to help defeat Diabolo and eventually goes to the Moon with them.

Appearance: An ordinary elementary school boy with black hair and round glasses. His trademark is a yellow shirt and blue shorts. Physicality: He has a slender, approachable vibe. While he is not good at sports, he is kind-hearted and cannot ignore someone in trouble. Abilities: He is a genius at marksmanship and cat's cradle, and he displays great courage and creativity in desperate situations. His strong feelings for his friends help him overcome many difficulties. He lives with Doraemon. As he meets and talks with Luka and the others, he decides he wants to fight alongside them and goes to the Moon with Doraemon and the rest.

Appearance: A boy characterized by a sturdy build and short hair. He often wears orange clothes. Physicality: While he gives a large and powerful impression, he is characterized by thick eyebrows and a rounded face, with a robust physique. Personality: Usually rowdy and overconfident, he has a compassionate and thick-skinned side for his friends. He never abandons a friend in trouble and is a reliable presence who stands up bravely when the time comes. After hearing Luka's story, he eventually goes to the Moon.

Appearance: A boy characterized by a sharp, pointed hairstyle and a narrow, fox-like face. He often wears green clothes. Physicality: He has a small and slender build, with sharp eyes and a pointed mouth. He is stylish and pays attention to his grooming. Personality: He brags a lot and is a bit of a show-off, but he is quick-witted and resourceful. Although he has a cowardly side, he also possesses the kindness to value his friends. After hearing Luka's story, he eventually goes to the Moon.

Appearance: A cute girl with shoulder-length black hair. Red ribbons and pink clothes suit her well. Physicality: Characterized by well-defined features and a kind smile, she has an elegant and clean atmosphere. Personality: Compassionate, kind, and polite. She cannot ignore people in trouble and cherishes her friends. She eventually goes to the Moon after hearing Luka's story.

His true identity is a robot. He is the culprit who killed Luka's family and leads an army. He is trying to capture the Espals, including Luka, to steal their abilities.