Among the Demi-humans of the HeroBlog universe are many...most...of the legendary creature types. Including monsters and other critters. Most of them are not at all friendly to humans, but a small number of individuals have been helpful to humans throughout history. In this case, she's a pixie whose clan lives among humans. She has a name, but goes by Pyxi. She's four inches tall, can fly at bullet speeds and has a paralyzing venom in her stingers, which extend from her elbows. She's also very, very hard to kill.
When Liberator forms the new Valiants in the 27th century, she joins up.