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. Helium is excellent at voice modulation and often hits high notes; while usually gentle, Helium occasionally shows an unexpectedly psychopathic side. Sometimes, Helium spends time alone quietly, finding it too bothersome to play with other elements.

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

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

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

A creative, bright, and optimistic leader type. Carbon is the center of social circles, possessing high sociability and befriending almost any element easily. Carbon loves coming up with new ideas and takes good care of other elements. Being quite wealthy, Carbon has a relaxed demeanor 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 judge things rationally. Nitrogen likes peaceful and quiet atmospheres, enjoying tending to flowerpots and eating frozen desserts like ice cream. Nitrogen dislikes fire, hot summers, and stuffy, enclosed spaces.

Kind, gentle, and deeply considerate. Oxygen loves 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. While usually soft, Oxygen shows great resolve during critical moments.

Sensitive and prickly, yet full of curiosity. Fluorine reacts sensitively to even small things and is very assertive. Highly interested in new things, Fluorine approaches anything liked aggressively. Sometimes acting too bluntly leads to clashes with other elements. When angry, Fluorine's voice gets loud, and Fluorine smashes whatever objects are nearby.

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