Follow-up question by
It protects you from anything that wishes to do you harm, is always there to support you in times of need, will never do anything to hurt you like stab you in the back, and always has time to listen to all your problems. No wonder she thinks the Companion Cube is such a dreamboat!
Cyberia's design was inspired by Portal, and a bit of Megaman. She mostly takes after the turrets and Atlas/P-Body, but I guess the Companion Cube also left a strong impression and led me to give her a heart shaped cutie-mark!