Cave Johnson

Cave Johnson is the one that talks to Benjamin Hensley (Nickname "Ben") the most over the phone. His name is based off of the name of the old CEO of Aperture Science in the Portal series.

Appearance
His appearance is unknown, but is most likely a boy. First, he sounds like and is voiced by a boy. Second, Lisa mentions him a boy.

Personality
He is a friendly, welcoming character who is brothers to the CEO and is be Lisa's brother (mentioned in Night 5 and 6 phone calls).

Phone Calls
The first phone call, featuring only him. The second phone call, announcing his name. The third phone call, including Lisa near the end. The fifth phone call, showing Cave and Lisa's distress.

Voice Actor
MrFacePalm