Why does it have to be a character? Why not a device that a company like Czerka Corporation releases to the public and have a holo of their corporate logo, it would also be somewhat more lore friendly.

The Assembly Chamber is a place where you can combine shards, head to the Jedi Temple. Once you exit the elevator take a right and walk into the instance, it's like your own personal workshop. As you get close to the matrix the codex will unlock as datacron 6. http://www.swtor-spy.com/codex/assembly-chamber/1213/ Matrix Combo Guide: http://www.oldrepublic.net/273-swtor-matrix-cubes-relic-items.html