Review Detail of procrastination04 in DXD: A Nexus Devil (DXD x Multi-Crossover)

Story has a great idea behind it and the writing quality is good, with little to no mistakes. It also has a really good start, but things kinda go down from there.The MC is a nice guy with a good-natured personality, which I don't really mind. But he's written as a peacock, basically strutting around and allowing everyone else to bask in his greatness. All of his actions and words only serve as a reason for others to react with statements such as, "OMG, he so awesome! OMG, he so cool!" Calling him a perfect Gary Stu is a great way to describe him.The world is a mixture of Harry Potter and DxD, something which has been done successfully before. Unfortunately, it's really not the case here.We all know that the wizards of HP are idiots, but here they are stupid on another level, so much so that a majority of them don't even know the existence of the larger supernatural world. I honestly don't even understand how this is possible, but apparently only the rare person like Dumbledore is aware of how big the world is.