Nobody has attempted to add in a completely new live2D model as far as I know. It's definitely possible, but you'll have to figure out a lot of stuff yourself if you want to do it. If you don't have a dump of your version of Fates already, you'll need to go ahead and make one before doing anything else. From there, I'd suggest downloading FEAT for dealing with file compression. Ohana could be useful as well, though it's definitely not required for something like this.Hello! I've been searching for a while now and I was wondering if ANY of you knows how to do this or can point me in the right direction. I'm pretty new to all of this Fates hacking so please, bear with me. Hopefully I can explain myself correctly.
Alright. So I wanted to add a Live2d Model to a character that doesn't have one, Lucina. As some of you may know, Lucina has been implemented to Fates more as a normal unit thanks to UnassumingVenusaur's Gay Fates hack, but as far as I know, if you try to invite any character that doesn't have a My Room model, the game crashes. So I wanted to "fix" that. Add a new model based on someone else's model like this one HERE.
Is this even possible?
I already have Homebrew in my 3ds and I can launch UV's hack with NTR CFW if that matters.
As far as I know, everything with regards to live2D models is store in the live2D folder inside of the romfs. From a cursory glance, you'll need a folder to store motion data in, a bin file inside live2D/LipSynch, and model/textures stored in live2D/model. You can probably just name the folder LUCINA and copy over motion data from another folder, though I can't guarantee that something like that will work. The lip synch file will take some modification to get the proper voice lines to play. The file uses the standard bin format for Fates, which you can read about here. Finally, the model itself is stored as a .moc (Live2D model). The textures are stored as .ctpk files. I'm fairly certain that there are tools out there for converting to .ctpk, though I can't remember any off of the top of my head. There may be more to adding in the model that I'm not seeing, but that should be enough to get you started.
Good luck!