Hazel is the only child of Hector and Margaret Selwyn. She is first in line as heir to the the great mage house of Selwyn. The Selwyns are famous for their community outreach and charity work. They are always held in high regard, and considered one of the few great houses who acts generally altruistically.

Hazel is bright, energetic, and cutesy. As per her surname, she generally acts kind, quick to offer help and empathy to those around her. The average person would say she does well by her family name to represent their ideals. She can joke around but is generally and extremely earnest and straight-shooting person.

Though she is kind, she can be often teasing or a bit playful, which sometimes makes her come off as slightly immature. Without mincing words, she is a bit of a "little stinker". In the first episode, she is only 14, but even after she gets a bit older, she remains feeling a bit childish for her age.

A good way I would describe Hazel, is that she read the book "How to Make Friends and Influence People" and then built her entire personality around that book, to a fault.