Speaking specifically to the part of your question about blue mage, this is actually largely tied to the lore of FFXI. In order to summon alter egos through the use of Trust magic, you need to draw upon the powers of friendship and camaraderie, as well as have a special bond with these adventurers. Blue mages are essentially empty vessels that are living weapons and lack the aforementioned traits, so it’s not possible to form bonds with them in this way.
Furthermore, most of the NPCs that are blue mages only stay around Aht Urhgan and do not travel abroad.
Lore aside, there are also various hurdles that need to be overcome in order to add a blue mage alter ego, such as whether they learn spells, what spells they are able to use, and how to setup flags and manage these aspects.
Due to these reasons we do not have any plans to introduce a blue mage alter ego.

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