Continuing the design talk, how about this.

Favorite Version of KOS-MOS?

Episode 1
(SPOILER)

Episode 2 (that uncanny valley look in her face just makes her look brainless, not emotionless)
(SPOILER)

Episode 3 - Version 3
(SPOILER)

Episode 3 - Version 4
(SPOILER)


Oh and there is one more version...
Xenosaga I - 31 - Cherenkov and KOS-MOS - YouTube

Archetype KOS-MOS is scary as hell.