Echidna (エキドナ, Ekidona)
Voiced by: Kaede Hondo[1] (Japanese); Olivia Swasey[3] (English)
The Demon Queen with long pink hair and black horns who is the daughter of Cychreus. Echidna came from the Demon World to obtain the Philosopher's Stone, hoping it would make the Demon World habitable, only to be defeated by Leo Demonheart. While Echidna does not want Leo to join up with her, the Elite Four go behind her back by having Leo work to rebuild Echidna's army in secret.