A "wild elf" from the southern jungles, Echidna is an elven mercenary with over 500 years of experience. In the past she led the Assassins of the Fang, but is now a mercenary.

She is considered a favorite to win the Queen's Blade tournament, but her current employer is unknown - all that is certain is that she herself has no interest in the throne.

She is voiced by Yuki Kaida in the anime. Also in the anime, she wears a poisonous snake, which she keeps as a pet and has it help her fight on occasion. She was created by the artist F.S - By Wesker_CDA