Hey guys long time no post. I can translate for you!
From what I've read, the "My Unit" is as close to fully customizable as nintendo will allow.
You'll be able to customize things like:
-Name(duh)
-hair color and style
-class
- and expression( doesn't exactly say that but judging by all the pictures it looks obvious)
-You can also add accesories...
Knowing the fire emblem interface this will probably be based on some points system...
The unit in question plays the role of the "tactician" (like in FE7, but this time you can also kick some ass), that decides to join Marths army...
Other than the return of side stories and prologues. The game is pretty much the same as the original.
Much love to The FE Fans! this games gonna be great!
FE PHREAK.