The relationship can be developed through shared experiences. For example, if they face a common enemy together. Yusuke's demon powers can be used to protect Keiko, which deepens their bond. Also, communication is key. Yusuke can open up to Keiko about his new life as a demon, and she can share her fears and concerns about his transformation.
One idea could be that Demon Yusuke has to protect Keiko from other malevolent demons while hiding his true nature from her at first. As the story progresses, Keiko discovers his secret and has to come to terms with it. Another plot could be a time - travel scenario where Yusuke goes back in time to save Keiko from a danger that she faced in the past, which changes the course of their relationship in the present.
My knowledge doesn't have anything related to the main character becoming a demon king. Can you provide me with more relevant information so that I can better answer your questions?
In fanfiction, Kurama is often depicted as calm, intelligent and elegant. His plant - based powers are usually a central part of the stories, whether he's using them for combat or for more peaceful purposes like healing. Yusuke, on the other hand, is usually portrayed as hot - headed but with a good heart. His impulsive nature gets him into trouble but also makes him a very dynamic character. He's also known for his strong fighting spirit.
One plot idea could be that Demon Yusuke has to protect Keiko from other demons who see her as a way to get to Yusuke. Another could be Yusuke trying to balance his demon side with his relationship with Keiko, like when he has to hide his new powers and instincts from her at first. Maybe there could also be a plot where Keiko discovers a way to temporarily become a demon herself to be closer to Yusuke's world.
The relationship could develop in a rather unique way. Maybe Yusuke saves Keiko from a life - threatening situation, which makes Keiko see him in a new light. Yusuke, on the other hand, is drawn to Keiko's purity and kindness. As they spend more time together, Yusuke starts to change for the better because of Keiko's influence. Their relationship might be full of misunderstandings at first, but as they communicate more, they grow closer and closer, eventually falling in love.
One possibility could be that Percy, as a demon, struggles with his new identity. He might have to deal with new powers that are difficult to control. For example, he could accidentally harm his friends. He may also face discrimination from those who fear demons, even though he's still the same person deep down.
Yusuke would likely become more withdrawn. He was always a bit of a rough - around - the - edges character, but Keiko's death would make him more somber. He might lose his sense of humor that he sometimes showed around her.