アストレア

Astraea is a large-breasted "Local-Combat Angeloid, Type Delta" sent by Synapse to kill Tomoki. She is strong in combat and emotion compared to Ikaros, but because of that allocation, her weakness is her low processing power, and the other Angeloids consider her an idiot; this is affirmed when she bungles her multiple chances to kill Tomoki at the Buddhist temple, and later at the quiz show where she fails basic questions such as "what is 1+1". She is often famished because she does not know how to hunt or to obtain food by her own means.

After spending time with Tomoki, she refuses Master's order to kill Nymph, and severs her own chain.

Astraea is named after the Greek mythological figure Astraea, who was a goddess of justice that later became the constellations Virgo and Libra.