Just some of my obserations:

You are recognized as a person of destiny by the crystal you bear. In FFI, the warriors of Light were recognized in the same way.
Possible reference: Major NPCs are unable to recognize Legacy players as the warriors of light, despite their deeds in v1. FFI ended with the warriors of light closing the time loop that caused the rise of the fiends, and as a result erased all knowledge of their deeds from the timeline. Essentially, no one remembers them or what they did.

(note: MAJOR SPOILERS!!! you have been warned)
Thancred betrays you, and is revealed to be under mind control, not unlike Kain in FFIV
The "one true god" the Ascians worship: Zodiark
In addition, the Ascians are immortal, undying, and involve themselves in the affairs of mortals much like the Occuria. In particular, they appear to be influencing Gaius' descision to invade Eorzea, much like Venat.
Some of Gaius' ideals are remarkably similar to Vayne Solidor