Sothe Could probably work as an important character, but they already have Soren, so maybe too much GC era? Maybe one day they will have year 2 of DLC? Add some popular characters like Takumi or Ryoma (they both seem like they would have ninja stars, haha)
Or maybe some villain emblems could come out with some cool knives.
I would have liked to see more monster-type Emblems like Tiki. Maybe A Laguz or the other animals from Fates/Awakening. Seems like wasted potential. Could have been interesting to have some more beasts running around.