Cara and Mia Aggio (Mia is an hour older than her brother)
23 year old twins. The only thing clear in their minds is a robotic female voice, promises of cake, and each other. They were separated when their orphanage sent them to Aperture, and they wrecked some havoc. Cara, the boy and often called Car by his sister, was sent to stasis with a bunch of other humans right before the GLaDOS project went online. Mia, the girl, was sent to testing, and eventually stasis in the pods knocked over by Wheatley in the second game. Once awake, she'll be determined to find her brother.