Fire Emblem Engage - Alear into Lyn Part 1 (Patreon)

Lyn has always been popular in Fire Emblem, so it came as no surprise that she would be one of the emblems we get to use in the game.  This particular piece was made before the game even came out, but luckily with FEE's story being typical anime stuff it's not too hard to make things fit.

It would have been nice if the ring changes your appearance more than the "Tales of Zestiria" look, but that's why there are fan works who can do this, because genderbending between sexes needs a proper transformation sequence