I'm guessing that the bhd is Jeannette's real dad and the bhd is Claude's brother. And bhd is trying to kill Jeannette's "Father" and kill Claude, then take Jeannette to the empirical palace and maybe abandon Athanasia. But in stories like these it tends to be the total opposite of what I just said so this is probably not gonna happen. And the black haired dude can such my dick (︶︿︶)=凸
Isn't it obvious, Claude knew even in the novel that Jeanette not his daughter but his brother and his ex fiancee daughter from the moment he saw her. The BHD is Claude brother, he used to be nice to Claude when they are younger, but then those black aura started to calling him and possessed him and he is changed for the worse, but they still not assimilated yet that's why Claude able to kill him (the black aura is the Emperor who is known as the strongest emperor in history but Lucas insulted him when he is a child).
Now the BHD came back to life and assimilated completely with the black aura. I guess he used immortal tree fruit or whatever it names (I forgot) cause when Lucas go to the tree location someone intentionally wasted all the fruit leaving nothing left so Lucas has no choice but to threaten the tree to give him the root (it's even better than the fruit)











I’m gonna have to let this marinate for a few months cause…