1
GLaDOS
2
Cave Johnson
3
Wheatley
4
Chell
5
Companion Cube
6
Caroline
7
Oracle Turret
8
Fact Sphere
9
Doug Rattmann
10
Space Sphere
11
Adventure Sphere
12
Sentry Turret
13
Defective Turret
14
Frankenturret
15
Anger Core
16
Morality Core
17
Atlas
18
P-Body
19
Curiosity Core
20
Intelligence Core
21
Greg
22
Grady