I haven't been going through the files, since I don't want to clutter up my system with gigs of a Wii U dump, but does Breath of the Wild contain a font file similar to Brawl and Smash 4 (Smash uses what seems to be either .brf or .fgb in its font directories for Wii U).
If it really was a font file, even if it's hi-res textures, it might help that Hylia Serif project going on.
If it really was a font file, even if it's hi-res textures, it might help that Hylia Serif project going on.