So I'm going back to the Sierra idea. SIERRA (Search, Investigate and Execute Rapid Recovery of Archives), yeah that works as an acronym. SIERRA is the last program Kevin Flynn wrote, tucked away deep in the system so that CLU wouldn't find her and kept in "sleep" mode. SIERRA was intended to wake up in the case of a catastrophic failure and make sure that certain bits of the system were properly stored away for later use. Flynn's act of re-integration with CLU triggers her awakening, and she begins the process of fulfilling her programming, making a last dash effort to back up these critical parts and get in the IO stream that Sam has activated by backing up the system.
The model is based on some of the concept art for Tron Legacy, specifically that of Phil Saunders and Neville Page (his is the first image).
So here's an attempt at getting started on this in Zbrush, used a base mesh built in Modo.
Experiments with getting paneling to work in ZB:
Mesh with details built in