Quoting Foxd1e, reply 24I thought that might be the case as well but I tried exactly that and it still sets it to the default bio, so I'm just gonna hold off on penning wonderful descriptive biographies until Stardock takes a look at it.
Have you checked the character details? From what I can tell, in FE, custom descriptions show up in the details once you start to play, but not in the opening narration. It probably works the same in LH.
I thought I checked that as well, but I'll doublecheck to be sure.
