Hydrogen is a calm and simple catto, and often acts very friendly and kind toward others. She readily bonds with elements like Carbon, Nitrogen and Oxygen. She is very fond of her siblings, which include Deuterium and Tritium. She also considers Muonium part of her family due to ehr having some similar properties to her. She sees Antihydrogen as her sibling as well. Hydrogen is friends with other light gases, but has a habit of easily exploding on oxidizers like Oxygen, Fluorine or Chlorine. She is a fan of Mat Jarvis and Wolfgang Voigt.
