Leda is one of three robots sent by Braiking Boss to kill Luna. After the Ruin begins, she spends her time alongside Dio.
Leda is initially silent-but-deadly, but reveals a crueler, colder side later on. She is considered extremely beautiful by many; she is acutely aware of this, and is obsessed with being the 'most beautiful', going so far as too attack Casshern simply because he is beautiful as well. She travels with Dio, another robot sent by Braiking Boss. A romantic relationship is implied between the two, though she seems more keen to use him by taking advantage of his emotional insecurities.
At one time, she was pregnant and it is implied that the child is Ringo. An allusion to this could be the hair color, which they both share, as well as the long flowing hair Ringo has as she grows up.
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