I agree with the idea of the lord being customizable or either female/male. We saw two sprites, one with short hair and one with long hair.
Now what I'll say here may seems far-fetched
This part with the dragon underwater... I believe Kamui is that dragon.
As stated on the picture above, during the translation to more of a "human" apperance, we can clearly see the clothes get detailed but not the hair which is odd to me. Overall, his costume seems to match the dragon's design...
And that girl who looks like Ninian seems to have a dragon stone around her neck so I wouldn't be surprised if she was one either...