Chaos is a second-generation Angeloid, designated Type Epsilon. Secretly created by the Master of Synapse as the first advanced model surpassing the first generation, Chaos was initially deployed to Earth as an antagonist. Assigned missions to eliminate Tomoki Sakurai and retrieve or destroy the "betraying" Angeloids Ikaros and Nymph, Chaos stands 107 cm tall, weighs 19 kg, and possesses "Imperfect Variable, Amphibian" wings, presenting a childlike figure. A unique, perpetually active PANDORA System, modified by the Master of Synapse, grants Chaos continuous adaptation and evolution. This allowed escape after six months trapped in the deepest Pacific Ocean trench. The isolation trauma forged an association between love and torture/pain, leading Chaos to torture marine life believing it expressed love. Chaos employs deceptive tactics, including shapeshifting into others like Tomoki or Mikako to infiltrate and psychologically manipulate targets. During a confrontation with Nymph, Chaos impersonated Tomoki to provoke a self-destruct command while demanding explanations about love, revealing confusion over why Angeloids defy orders for human emotions. Chaos demonstrates notable physical resilience, withstanding attacks like Nymph's Paradise Song unharmed. A pivotal evolution occurred when Astraea spared Chaos despite orders to destroy her. This act of mercy began unraveling Chaos's distorted understanding, leading to the realization that love involves compassion rather than pain. Consequently, Chaos abandoned hostility, joined Tomoki's group alongside Nymph and Astraea, rejected the Master of Synapse, accepted Tomoki as a new master, and integrated into the household, transitioning from antagonist to ally.