The Gray Dust: other than in the relics, magic currently is essentially inaccessible. That might change later, but not soon. Relics are more commonly seen now than before, but what else they will do is yet to be seen.
Without access to 'proper' magic and with the knowledge of how they were made lost, modern relics are lost. Some relics have gifting as an ability, and that generally relies upon some object to store the power in. However, while empowered such objects aren't truly relics.

All accessible magic to characters comes from relics. Your character needs to be alive in that sense, not some artificially animated thing. But people don't really know much about magic, so they can easily be gulped into thinking all sorts of things. Just beware that certain people don't like magic or relics.

McHaggis: good character. Just one area we'd recommend tweaking. The church in Kalnach is much more present and overbearing than in Othea. Even far from capital and so forth, they would pursue anything remotely magical. We'd suggest that he was forced to flee after an inquisitor came to investigate his village. That'll give him extra reason to be in Othea. 

Maki: don't worry just fit your old concept more or less to the new CS framework and make sure it meets the stuff described in lore about relics and you should be quite good. In other words, minor tweaks. We only revised ours completely because we wanted to. 
Also, if you're good at creating IntCks Maki, then yes, feel free to do so.

Echo: new lore if major and/or Possibly conflicting with anything, post it here. Sections that are generally agreed upon by many, post there. Review here, really. The goal is to keep that thread fairly clean. Fewer post by each being better. Hikers are useful there. Later we might add a table of contents to the lore OP.

To those we've not answered questions for and such: Hai.