Reiyon is an Hanjuujin. Quote from Chelsea when she explains what an Hanjuujin is: "Long ago, there was some research that inserted animal genes into humans. What was born from that are the Hanjuujins. The Hanjuujins are equal in strength to the elemental uesrs. But for some reason... The research was suddenly interupted. And the Hanjuujins were sent elsewhere."  Reiyon first appears in the end of episode 21, but isn't introduced untill later in episode 22.

Under the capital city of Tokyo, Japan, there exists a large, vast, and unknown world known as Underground. There, people known as Elemental Users exist; people who have the ability to control the elements: Fire, Water, Lightning, Magnetism, Freeze, etc. Meet Rumina Asagi and his best friend Ginnosuke Isuzu, two average high school freshmen who reside in Tokyo. When they meets Gravity User, Chelsea Rorec, and the Miko of Life, Ruri Sarasa, their whole life changes into one big adventure.
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(Source: Anime News Network)

Hobbies: Cooking, swimming
Skills & Abilities: Baton, Chinese (from her stay in Taichung Japanese School, Taiwan)

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Hendrikse was born in the Bahamas before immigrating to Canada when she was two and a half years old.