Everything before GCN will be a custom bitmapped font. You get it by locating the graphic in the ROM, decompressing LZ77 etc. In some cases there isn't even a font and text, there's just one big bitmap (IIRC, FE6 chapter titles are like this, but FE7 uses actual lettering).
That said, it's certainly *possible* to design ttf fonts that *look like* the existing bitmaps, if you use them at the original size. Sounds like a shitload of work, though.