Another plot could involve the Blue Dragon Emperor forming an unlikely alliance. For example, teaming up with a former enemy to face a greater threat that endangers both the devil and dragon factions. This would lead to a lot of character development and interesting interactions.
One interesting plot idea could be the Blue Dragon Emperor exploring new and unknown powers within him. Maybe he discovers a hidden ability that changes the power balance in the High School DxD universe.
A more complex plot idea might be the Blue Dragon Emperor getting transported to a different dimension. In this new world, he has to adapt quickly and find a way back while also dealing with new challenges and making new allies. This would give the writer a chance to explore different settings and expand the lore of the High School DxD world.
Chapter 463, ", Didn't Use Full Strength? Slander!", is the clearest early answer because it turns Interstellar Warrior's situation into a concrete plot event. A useful checkpoint is the way the scene starts with I don't have that qualification..." After hearing Gu Hang's words,... and follows through with What are you doing building these large-investment, long-term vision....
Chapter 481, ", Only a Madman Would Pay You Taxes!", is the clearest early answer because it turns Fury Flame Battle's situation into a concrete plot event. It opens with But for now, it was enough. and closes on Demons wishing to invade Rage Owl Star?.
Chapter 293, "You want 300 million?", is the clearest early answer because it turns Heijian Star's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Furthermore, deciding whether to turn a blind eye depended on... and follows through with The other party nodded, indicating understanding..
Chapter 459, ", Cruiser Technology!", is the clearest early answer because it turns Cruiser Technology's situation into a concrete plot event. The chapter turns that into something concrete by moving from In no time, merely half a year later, Gu Hang was able to see on the... to The other part was the income from annihilating the Ashen Dead Squad,.... What makes it stick is that the chapter closes with Ordinarily, Gu Hang needn't worry about the level elevation;
Chapter 363, ", Something's Not Right", is the clearest early answer because it turns Ge Wajia's situation into a concrete plot event. It opens with These demons, existing by relying on subspace power, naturally began... and closes on However, what Ge Wajia had to face was not just a simple 'heat....
Chapter 456, ", The War Situation Changes Drastically", is the clearest early answer because the buildup finally cashes out in a real clash. The chapter turns that into something concrete by moving from The arrival of the Furyflame Legion was the salvation desperately... to This was a consolidating experience from the Empire's history of....
Chapter 437, ", Humanity Must Triumph", is the clearest early answer because it turns Zhu Zhengbao's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Among them were warriors, heroes, and even women and children. and follows through with That was the Extinction Order from the Empire, that was the Skyburn....
Chapter 468, ", Reverse Beheading", is the clearest early answer because it turns Orc Warlord's situation into a concrete plot event. It opens with Although he had never personally dealt with them, Saru knew these... and closes on Bombs and heavy bombs that didn't break through allowed some damage.... The key payoff is that the chapter closes with This instantly gave Saru an opening.
Chapter 356, ", Subspace Smuggling Plan", is the clearest early answer because it turns Spiritual Energy's situation into a concrete plot event. It opens with At the same time, as they penetrated deeper, the enemy's movements... and closes on It was even worse than when teleportation malfunctions occurred over.... The key payoff is that the chapter closes with An hour earlier than yesterday!, which gives Spiritual Energy a stronger narrative position and pushes the power growth onward.
Chapter 325, ", He's Not Dead", is the clearest early answer because the violence around Matins becomes final instead of hypothetical. The chapter turns that into something concrete by moving from Even though he was the one in charge of all military actions on... to However, the opposition was not without its advantages.. What makes it stick is that the chapter closes with The Spiritual Energy users and Interstellar Warriors did not disappoint;