The Era 2 character Marasi is Very similar to Era 1 character Vin, more so than simply being inspired by the "Ascended Warrior" could be credited.
Examples: Her love of dresses despite her unitarian beliefs on clothing, and her initial attractive to an older man followed by a romance with a man from a different culture.
I have a few theories:
1. Sanderson gave Marasi these character traits as a 'easter egg' to fans of the first Trilogy.
2. Sazed missed Vin, and used Harmony's power to memorialize her in people born on his planet.
3. This is a possible indication of Reincarnation in the Cosmere.
4. You tell me?