Echidna is a wild elf from the southern jungles who became an elven mercenary with over 500 years of experience.
Echidna stayed in the same forest as Alleyne and Nowa, but left before Nowa was born. After leaving the the Elven forest Echidna became an assassin, eventually making enemies with the queen and her royal assassins. As she traveled she stumbled upon a burning village where the saved and met her first apprentice Irma rather. Echidna said they would stay together forever, only to leave Irma once she joined the assassin fang. Echidna was trying her best to teach her student and keep her out of harms way, but Irma wanted revenge which meant getting close enough to the queen to kill her. A little while after the the Queens Blade began Echidna met a girl named Reina who she trained in the art of sword play for three days straight against a warrior named Risty as she is more commonly called. Some time after this training she made her way into Gainos the Queens Blade tournament was being held. Once there she decided to join the Queens Blade. Also there is where she met up with Irma again, who had hated Echidna for abandoning her, and would only speak to Echidna with a cold hateful tone, also she had left the the assassin Fang or Kiba assassin group.
But as fate would have it, and due to the queens dirty tactics Irma another Queens Blade contestant was being hunted by the queens assassins, as well as a possessed Risty. Irma would have died if Echidna decided not not save her. after the first attack Echdina had to do her first match against Alleyne. But as the two fought they realized they were not alone. The queens match became a two on two match up. Irma and Echidna versus Nowa and Alleyne. The match ended in victory for Irma and Echidna. After that match Echidna suddenly quit. No one saw her in any other fights. Shortly after her beloved Irma was forced to fight the possed Risty and lost badly. Echidna found Irma laying down in the street, took her home and cleaned her up.
A little fun fact Echidna uses a poisoness snake as her panties.