She is a large, dragon-like demon who is master of a demonic forest that is home to many underworld creatures.
Echinda scatters her seeds across the forest in order for them to hatch and latch onto other demons to create Chimera. Echinda's goal is to create a world where demons prosper by combining with her parasitic children. Though she appears as a dragon, Echinda is capable of retracting the sides of her head and tongue to appear as a woman surrounded by petals.
During the events of Devil May Cry 4, she faces Nero, and later Dante, in battle. After being defeated by Nero, she retreats back into the underworld, returning later only to encounter Dante again, who then defeats and destroys her, shattering her body with bullets.