Sure fuck the prince but the priest was the worst, both because of the intentional creepiness and because he wasn't developed very much. The Duke wasn't even that bad tbh, and he ended up getting the worst ending, poor guy.
The actual antagonist being causality makes up for the dudes being a bit sub-par, so many of these reincarnation/transmigration stories just have the protagonist fuck around without much to do. That dragon really screwed things up for everybody.
Last thing, what the hell was that section with the marquis' wife? Everything about the marquis was weird tbh, the king really let him just do whatever.