At this point the Overlord part is getting into events only covered in the light novels, which has events I find deserve changing. Disclaimer: I don't own Jojo's Bizarre Adventure, My Little Pony: Friendship is Magic, or Overlord.
Spirit Tracks Chapter 35: Demon King and Holy Queen
Ulbert dragged himself to the gates of the Holy Kingdom. He had just been in a fight with Buser, leader of the bafolk. Realizing the horned demon Yaldabaoth was the one calling the shots, Ulbert had decided to focus My Band's power on Buser to drive a wedge in the alliance between the demon and the bafolk. Of course, he had nearly paid for it in the process. 'Didn't expect Buser to be so strong. If not for my Stand's natural durability I'd be dead right now.' As he started to fade out of consciousness, he saw a beautiful blonde-haired woman kneel over him, her face full of concern.
Ulbert opened his eyes to the sound of voices. Both of them female. He noted he was in a well-furnished room, and had been sleeping in a four-post bed. He was also half-dressed, only his pants still being worn. Finding the rest of his suit nearby, he slipped it on and looked out the nearby window. An entire cityscape was just outside. 'The capital of Roble no doubt. Which means I must be in the palace.' He decided to follow the sound of the voices and realized they were right outside the door of the room he was in.
"I'm telling you," said a deeper, female voice, "No normal human could have survived a fight with Buser. He's no soldier or spellcaster, so he has to be a Stand user." "And what of it?," said the other voice, also female but higher-pitched. It almost sounded like bells to Ulbert, and he found himself blushing at the sound. The younger woman continued. "Your paladin forces have been nearly useless in protecting the city, Remedios. If not for reports that Yaldabaoth had been engaged by a rival demon during the last attack..." There was a pause.
"I'm sorry Calca," the woman identified as Remedios said, "I know it was a near thing, and it's possible you might have lost your life. Your brother is worried about you out on the front lines, you know." 'So the younger woman is Calca Bessarez, the Holy Queen,' Ulbert noted, 'Tolkien noted a member of the Unity Faction named Caspond Bessarez. A relative perhaps, and someone who helped facilitate this war. Looks like Yaldabaoth was intending to do something that would result in Calca's death, but Demiurge attacking him prevented that.'
"Anyway," Calca continued, "We need stronger forces to deal with the bafolk. We must hold them back until Yaldabaoth can be defeated, at which point they may start to listen to reason." She opened the door, causing Ulbert to take a step back. "And this man might just be able to help us find-," Calca started before she caught sight of Ulbert right inside the door. Ulbert also caught sight of Calca, and was practically stunned by her beauty. Calca in turn, seemed to pause at Ulbert's handsome face. Remedios looked at the two of them and sighed. "Maybe I should leave you two alone." She walked out, closing the door behind her.
Ulbert was the first to speak. "Well... That was awkward." Calca snapped out her reverie. "Uh... A little bit. I'm assuming you overheard our names just now." "Calca Bessarez, correct?," Ulbert asked, "I come from south of Re-Estize and keep up with current events, so I've already heard of you. My name is Ulbert Alain Odle." He gave a polite bow. "A pleasure to meet you," Calca replied, "Tell me, is it true you are a Stand user?" "It is," Ulbert admitted, "Me and some others heard of the war here and hoped to offer our support. My first step was to inflict the leader of the bafolk with my Stand's effect. It was successful, but unfortunately I underestimated his strength."
"How do you mean?," Calca asked. "My Stand inflicts those who defeat it for the first time with a growing sense of aggression," Ulbert explained, "They will start to see themselves as a superior fighter and as a result their ego will clash with others, especially allies. To facilitate this, my Stand's power is weakened to the point where it is easy to defeat." Calca's eyes widened in realization. "So over time Buser will start to argue with Yaldabaoth." "And when he finds me again," Ulbert said, "He will find me far stronger. Should he lose, he will be crushed in his despair at being so easily fooled."
Just then a flapping sound was heard outside the window, and Ulbert spotted Demiurge outside. "Good grief, Demiurge," Ulbert said, "You'll give the people of this city a collective heart attack." "Apologies," Demiurge said, "May I come in, Your Highness? I wish to speak with my master." "Master?," Calca asked. She let Demiurge in, and he clarified. "Lord Ulbert is a human, but he has charisma that exceeds any demon. It would not be an exaggeration to call him a Demon King in spite of his race. Many of my kind within Nazarick serve him without question. Yaldabaoth called us fools because of this, hence the reason I attacked him. Well, I would have fought him anyway since he is aligned with our enemies, but this gave me added justification."
Ulbert explained all about their actions thus far, the abilities of their allies, the Unity Faction and their designs, and the plans to restore the Spirit Tracks. "We have seen several beams of light from other sacred sights," Calca noted, "Including the Mountain Temple not too long ago." Ulbert nodded. "George and his team were able to release the magic well inside. We suspect the Unity Faction was planning on using the Stand users stationed there to secretly take control of this kingdom. After which they would likely send forces to conquer the other three."
Yaldabaoth met with Barbro and Boullope. "A pleasure, Your Highness. What news of your efforts in your own kingdom?" "It's not my kingdom anymore," Barbro said, "Our faction has been exposed and I have been disinherited by Father. But I am still a prince by blood, and can still take the throne through other means. Our efforts here in Roble are crucial. The united force of beastmen and paladins could overwhelm the other three countries. What of our allies within the Mountain Temple?" "The magic well was recently unsealed," Yaldabaoth said sadly, "I don't know what happened the forces we had stationed there. It's possible they may all be dead."
"Even if they were captured," Boullope said, "We are in no position to offer rescue." "There's something else," Yaldabaoth said, "Buser recently fought a man alongside two demons. One seemed to possess him, the other was a gentleman named Demiurge. I found it insulting that he would serve a human rather than being an equal partner like we are, and he attacked me for it, preventing me from taking part in a crucial battle." Barbro sighed. "Then we can assume Her Majesty Queen Calca is still alive. So long as she lives putting Caspond on the throne is near impossible."
He then realized something. "This man with the demon? Did Buser defeat him?" "Well, yes," Yaldabaoth said, "But he was able to escape. Since then Buser has been growing increasingly restless, and even started questioning my authority." He paused. "That man was a Stand user, wasn't he?" "I overheard this man, Ulbert Alain Odle by name, explain his power to one George Joestar III," Barbro said, "It seems unlike George, whose Stand and mental disciple mitigated the effect, Buser got the full force of Ulbert's Stand."
"This complicated matters," Yaldabaoth said, "I think at this point we should consider that our enemies are aware of our schemes, and seek to repurpose them for their own ends." "Which would leave us no choice but to take a direct route in terms of taking over Roble," Barbro noted, "I wish Femel was still available. His Stand would make it easy to determine how best to win a more direct war." "I'll do what I can to mitigate the situation with Buser," Yaldabaoth assured him, "At the same time, perhaps you can take direct control of our forces. One way or another, we must take control of the Roble Holy Kingdom."
So yeah, in this universe Demiurge and Yaldabaoth are two separate beings. Read and review.