An Elemental Human in the form of a beautiful girl with crimson hair and red eyes. She has a refreshing personality but possesses a short fuse, sometimes exploding with a fiery temper. Surprisingly, she loves sweets, but she seems sad because they are hard to come by. She harbors curiosity and a slight liking for Guest, who came from another place. She is about 170cm tall, and the white anklet-like object on her leg is said to be for controlling her power. Since Elemental Humans have no gender, Sodium-chan is also genderless. Although she looks like a teenager, she has lived so long that she has forgotten her own age. Her alias is "Explosion Fanatic" because she has a tendency to try and blow up her surroundings whenever she gets bored.