Demon Lord Tasogare

The final boss of the Demon King Castle, and the perpetrator behind the Princess's kidnapping. He proclaims that he has obtained all the power necessary to permanently separate demonkind from humans, but what he's most concerned with is managing flags and balancing out fights. Due to this, he is constantly baffled by the Princess going against the "rules" of their world and the behavior of a normal hostage; he is also quite shy when it comes to the Princess, as he hasn't interacted with humans much.