Throughout the Series
In Coup de Grâce, Echo is seen in a cage next to Bellamy in Mount Weather. She quickly tells Bellamy "Quiet. They take the strongest" in Trigedasleng, which he doesn't understand. Bellamy asks what she said and Echo recognizes him as a Sky Person and spits on him. She then has the alliance explained to her.
Later when Echo is selected for Harvesting, Bellamy saves her by being "a live one". Echo then watches Bellamy as he is Harvested and after Maya comes to rescue Bellamy, Echo helps to hold down Sergeant Lovejoy as Bellamy chokes him to death. After Bellamy's tracking chip is taken from his arm, he promises Echo that he will come back for her.
She looks like many of the other grounders, Echo has brown hair, with blonde highlights and brown eyes.
Echo appears to be very loyal to her clan, and despises the Sky People.