Hot-tempered, mischievous, and free-spirited. Hydrogen loves science and books, and tends to act before thinking. A social butterfly who approaches even dangerous elements without fear, Hydrogen naturally becomes friends with radioactive elements in particular. Hydrogen is nicknamed 'Safety Hydrogen' because of a heavy safety helmet and is best friends with Helium.

A pacifist and Hydrogen's best friend. Helium loves music and floats around without legs. Skilled at voice modulation and often hitting high notes, Helium is usually gentle but occasionally shows an unexpected psychopathic side. Sometimes, Helium spends time alone quietly, refusing to play with any other elements simply because it feels like too much trouble.

Bright and active, but with a slightly prickly and prideful personality. Lithium is assertive and curious, enjoying trying new things firsthand. While Lithium likes hanging out with friends, personal time is also considered very important.

Possessing a calm and logical personality, Beryllium always analyzes situations coolly. Beryllium is knowledgeable, observant, and tends to act cautiously. Wearing glasses, Beryllium also has a side that quietly looks after those nearby.

A brainy type who is smart and firm in their own ways. Boron solves problems in ways others haven't thought of and has the initiative to move personally to find what is needed. Boron has a particular fondness for neutrons and has a habit of secretly stealing them.

A creative, bright, and optimistic leader type. With very high social skills, Carbon is the center of a network that easily befriends almost all elements. Carbon enjoys coming up with new ideas and takes good care of other elements. Being quite wealthy, Carbon has a relaxed side and keeps Boron's secret even after finding out about the neutron theft.

Quiet, blunt, and logical. Nitrogen doesn't show much emotion and tends to make rational judgments. Nitrogen likes peaceful and quiet atmospheres, enjoying tending to flowerpots and eating frozen desserts like ice cream. Nitrogen dislikes fire, hot summers, and suffocatingly enclosed spaces.

Kind, gentle, and deeply considerate. Oxygen likes helping other elements and is the first to step forward when someone is in trouble. With a strong spirit of sacrifice, Oxygen thinks of others before self. Usually soft-spoken, Oxygen shows great resolve during critical moments.

Sensitive and prickly, yet full of curiosity. Fluorine reacts sensitively to even minor things and is very assertive. Interested in new things, Fluorine actively approaches whatever catches their interest. Sometimes Fluorine clashes with other elements due to being too blunt. When angry, Fluorine's voice gets loud, and they smash whatever objects are nearby.

Calm and indifferent on the surface, but sly and full of mischief. Neon enjoys subtly teasing others and likes flashy, eye-catching things. Neon takes a quiet pride in their own glowing appearance and is usually laid-back, but can be surprisingly cold-hearted when necessary.