I think this is the most relevant thread as far as I understand so I'm posting the following Codex suggestions and submissions here.
First is my Wetraxxyl Codex Entry Submission (file attached) since the actual Codex Entry was never made. The team can edit it how they like to fix it if necessary, I just imitated other Codex Entries to try and make it look proper.
Secondly are suggested Codex entries that I might do but, anyone else could write too
A) Religions; while some of the listed religions in TiTs are far too obscure and so can't really have a proper Codex Entry, religions like The One and Zyi are elaborated on within the story enough to deserve their own entries, similar to the StormGuard entry.
B) Robotics, Androids/Gynoids and AI/VI: The only listed Androids are the V-KO and V-KO IV's. Seigwulfe ought to have their own entry, especially with how diverse their content is and so should the KihaCorp Gynoids, as we have 3 of them in game that are based on the same base model and are variants of one another (Gianna, Olympia and Syne). Additionally since there are many robots that aren't expanded enough on, it would be useful to have a general robotics codex entry for things like the Machina and Mining Robots, and an entry for the Fenris drones and the 2.0 upgrade.
As a side note for the Androids: the Bess/Ben-13 series are listed under Technology despite being androids, I assume because of the Maia series AI playing a role in Bess/Ben's side-quest.