3 to Renato Maiar. I'm also interested in F/A's sub-species Grail Wars, so I really like the Preserver concept you came up with. And the Case Files tie-in was cool as well.
2 to Feyam al-Sharim: Also pretty cool. The split personalities each with their own toolsets is pretty neat concept.
1 to Promachus Tuarin "PT" Barnum. It's a fun concept. It's a different take compared to what we usually see from the Nasuverse and its magical world, but I do still think it could fit in appropriately. It'd be cool to see him in a fic.