Kerberos

ケルベロス / ファントム・クイーン EX-X

Kerberos is an enigmatic android doll discovered by Hank along the shoreline. [Spoiler] In episode 10, it is revealed that, like Kaguya, she hails from another universe. Her mission is to safeguard Kaguya from the pirates, who also originate from their shared world. [/Spoiler] (Source: ANN, edited)