What is possible right now - RainThunder/fefates-tools GitHub Wiki

There are various attempt in Fire Emblem Fates ROM hacking, but all of them are scattered somewhere around the Internet, make it difficult to find.

List of major ROM hacking things that have already been done:

Edit text files (with SciresM's FEAT)
Extract CGs, unit sprites, model textures, Live2D model from the game (with SciresM's FEAT)
Change battle animations and character models via file swapping (by Linkmstr)
Change in-game character portrait (by Cellenseres)
Add more support to the game (by UnassumingVenusaur)
Change map data (unit data and distribution, by DeathChaos25). An example can be found here.
Restore swimsuit content in US version (by DeathChaos25)
Undub (by mauste on that iso site).
Reverse dub (English voice on Japanese version, by Raytwo on that iso site).
Make Amiibo units and capturable bosses recruitable via My Castle (by DeathChaos25 and RainThunder)
Unlock Hero battles and paralogues by default (by RainThunder)
Port DLC from Japanese version to English version (by RainThunder)
Custom playable character DLC (by DeathChaos25)
Script editing (by DeathChaos25)
Custom paralogue (by thane98)
Allow Corrin to unlock all Children paralogues on all routes (By MsMidnight)
Randomization (by thane98)

Minor stuff (like change a character's gender) are not documented here. They are most likely found in the modules in this repository.