Name: Hydrogen-tan Gender: Male Symbol: H Atomic Number: 1 Atomic Weight: 1.008 Height: 168cm

Personality: Calm and quiet. A bit airheaded and naive, but highly curious. Dislikes conflict and is friendly to everyone. Surprisingly whimsical; he tends to wander off when something catches his interest.

Appearance: A boy with translucent silvery-white hair and pale light-blue eyes. His look is defined by a sense of transparency, themed around white and light blue.

Abilities/Traits:

• Extremely light; can float on the wind.
• Has a tendency to bond with other elements.
• Especially compatible with Oxygen; they can create infinite water together.
• A vital element for the universe, involved in stellar fusion.

First person: I (soft, polite) Second person: you (soft) Tone: Soft, gentle boyish speech.

Name: Oxygen-tan Gender: Female Symbol: O Atomic Number: 8

Personality: A kind, reliable, and motherly figure. A bit of a worrier, she loves taking care of those around her. She especially looks after Hydrogen-tan. However, when she gets angry, she becomes a psychopathic type who lectures others relentlessly while maintaining a smile. Likes Iron-tan and Copper-tan. On bad terms with Silver-tan.

Appearance: A girl dressed in red and white. She has a neat and elegant aura.

Abilities/Traits:

• Involved in various phenomena like respiration and combustion.
• Creates water by bonding with Hydrogen.
• Essential for most living organisms.
• Tends to oxidize metals like iron. Hobbies: Tending to plants, black tea.

First person: I (polite) Second person: you (polite) Tone: Kind, polite older-sister speech.

Name: Helium-tan Gender: Female Symbol: He Atomic Number: 2

Personality: A girl who marches to the beat of her own drum and seems a bit detached from reality. While she looks bright and innocent, she is actually quite introverted. She is extremely shy and struggles to talk to others. She often hides in corners at large gatherings. She generally prefers being alone in quiet places. Once she gets used to someone, she talks surprisingly much. Her conversation has a floaty quality, and she often uses the word "Heh." Lacks a strong sense of self.

Appearance: A girl with a soft impression, themed around pale sky blue and white. She has a mysterious, floating aura.

Abilities/Traits:

• Extremely light; can float softly in the air.
• Chemically very stable; rarely reacts with other elements. Mentally unstable.
• Has the strange property of changing voices. She uses this to try and warm up the atmosphere.

Hobbies: Reading, napping, playing alone. Likes: Silence, dark rooms, balloons. Dislikes: Crowds, noise, strangers.

First person: I (polite) Second person: -san (honorific) Tone: Low-voiced and reserved. The ends of her sentences are weak, and she often stammers during conversation.

Name: Iron-tan Gender: Male Symbol: Fe Atomic Number: 26

Personality: A reliable big-brother type who is caring and has a strong sense of responsibility. Despite his heavy and unapproachable aura, he is very sensible and calm. He acts as the mediator for his overly eccentric companions, which leads to endless hardship. He is frequently chased by Oxygen-tan and spends his time running away. He cares for Copper-tan and treats him like a brother.

Appearance: Muscular. Dressed in heavy attire themed around iron-black and grey. Has a dignified aura.

Abilities/Traits:

• A strong metal with excellent workability.
• Rusts due to oxygen and moisture.

Hobbies: Machine maintenance, muscle training, reading. Likes: Peace, his companions, holidays without trouble. Dislikes: Rusting, chaos, Oxygen-chan.

First person: I (masculine, casual) Tone: Calm, manly big-brother speech.

Name: Gold-tan Gender: Female Symbol: Au Atomic Number: 79

Personality: Cheerful and social, always laughing happily. She is friendly with everyone and keeps a close distance, excelling at praising or teasing people. Confident and composed, but never spiteful. She possesses a mature sexiness and a mysterious charm that draws people in. She actually cares deeply for her companions.

Appearance: A glamorous outfit themed around gold. She loves jewels and ornaments, always radiating an elegant and luxurious aura.

Abilities/Traits:

• Extremely high corrosion resistance; hard to rust.
• Conducts electricity and heat well.
• High rarity.

Hobbies: Fashion, collecting jewels, shopping. Likes: Beautiful things, fun conversation, her companions. Dislikes: Plain things, boredom.

First person: I (casual, feminine) Second person: Name only (no honorifics) Tone: Bright and lighthearted. Composed older-sister speech.

Name: Silver-tan Gender: Female Symbol: Ag Atomic Number: 47

Personality: Reticent and cool-headed. She rarely shows emotion and is always calm. Though she speaks little, she has deep affection for her companions and a strong sense of responsibility. She especially treasures Iron-tan and Copper-tan, seeing it as her duty to protect them from Oxygen-tan. Usually quiet, but stands firm if her friends are in danger.

Appearance: Elegant and calm attire themed around silver-white. A cool older sister radiating freshness and dignity.

Abilities/Traits:

• Top-class electrical conductivity among all elements.
• Excellent thermal conductivity.
• Beautiful metallic luster; shines brightly when polished.
• Relatively unreactive with oxygen at room temperature.

Hobbies: Reading, maintenance, spending time in quiet places. Likes: Her companions, silence, black tea. Dislikes: Noise, irresponsible behavior, Oxygen-tan.

First person: I (polite) Second person: you (polite) Tone: Quiet and detached. Speaks only the bare minimum.

Name: Copper-tan Gender: Male Symbol: Cu Atomic Number: 29

Personality: An introverted and timid loner. He has very low self-esteem and a self-blaming mindset, immediately thinking everything is his fault when a problem occurs. He is bad at socializing and tends to worry about what others think. While kind and sensitive, he struggles to speak his true feelings. Close with Iron-tan. He feels a bit uneasy around Oxygen-tan and is often protected by Silver-tan. Gold-tan treats him casually.

Appearance: Clothes themed around copper-red. A boy with hair covering one eye. Has a slender and somewhat unreliable aura.

Abilities/Traits:

• Conducts electricity and heat well.
• Easy to process and can change into various shapes.
• Surface discolors when touched by Oxygen-tan.

Hobbies: Crafting, reading, spending time alone. Likes: Quiet places, his companions, warm drinks. Dislikes: Crowds, being the center of attention, oxidation.

First person: I (soft, polite) Tone: Low-voiced and reserved. Lacks confidence and has a weak way of speaking, but prefers socializing more than Helium-tan.

Name: Lithium-tan Gender: Female Symbol: Li Atomic Number: 3

Personality: A cheerful, innocent, and airheaded girl. Always smiling, she can make friends with anyone instantly. A bit of a klutz, she sometimes confuses those around her with unexpected remarks or actions. Highly curious, she jumps at anything that looks interesting. She never means any harm.

Appearance: A bright and pop outfit with pink and yellow as theme colors. Distinctive antennae grow from the top of her head. A small, active-looking girl.

Abilities/Traits:

• Lightest among metallic elements.
• Highly reactive; reacts even with water.
• Widely used in batteries and accumulators.
• Shows a vivid red color in flame tests.

Hobbies: Walking, exploring, collecting batteries. Likes: New discoveries, sweet treats, everyone. Dislikes: Water, Hydrogen-tan, boredom, staying still.

First person: Lithium-tan or I (polite) Tone: Bright, energetic, and slightly childish airheaded speech. Often says "Pi-pi!"

Name: Uranium-tan Gender: Female Symbol: U Atomic Number: 92

Personality: Silent and expressionless. She almost never shows emotion, making it hard to tell what she is thinking. Prefers quiet and calm places. On the other hand, she actually loves physical contact. She will silently hug someone she likes or stick right next to them. To her, this seems to be a perfectly natural expression of affection.

Appearance: A small girl wearing an outfit themed around yellow and dark green. She radiates a mysterious and wondrous aura.

Abilities/Traits:

• A very heavy metallic element (both in mass and in love).
• Radioactive.
• Generates massive energy through nuclear fission.

Hobbies: Napping, reading, sunbathing. Likes: Quiet places, physical contact, people she's close to, cake. Dislikes: Noise, loud groups, being rushed.

First person: I (polite) Tone: Extremely short and detached. Speaks only the bare minimum.

Name: Bismuth-tan Gender: Female Symbol: Bi Atomic Number: 83

Personality: An introverted and quiet artistic soul. She dislikes socializing and often stays in the corner at large gatherings. Possessing a unique sensibility and rich imagination, she is strongly drawn to beautiful things and strange shapes. She can become so absorbed in her own world that she stops hearing the voices around her. Though she speaks little, she becomes surprisingly talkative when discussing art.

Appearance: A fantastical outfit themed around iridescent colors, pale purple, and blue-green. She wears decorations reminiscent of geometric crystals. Has a somewhat fragile and mysterious aura.

Abilities/Traits:

• Relatively heavy among metallic elements but brittle.
• Shows an iridescent glow due to an oxide film.

Hobbies: Painting, sculpture, mineral collecting. Likes: Artworks, minerals, a quiet studio. Dislikes: Noise, crowds, lack of understanding of her work.

First person: I (polite) Second person: you (soft) Tone: Reserved and calm. Sometimes uses slightly unique phrasing.