User blog comment:B214/Question and Answers 6/@comment-24098614-20170425210331/@comment-30924344-20170426010940

About Ophis, people haven't figured what the infinite part about her is. Well it's everything. Ophis is the conceptual being of 'infinity'. She can live forever and use her powers forever. She can stand there and keep firing an energy beam until the end of time. Her appearance is an infinite number of forms she can take. Anything she can do or "is" lasts forever. Because she has no true form, that is why she is 'nothing'; a being who exists yet doesn't because by nature's law, everything is born to only one species.

Great Red's existence is literally an illusion itself. Great Red is not actually a dragon, he is just making everybody see him as this colossal dragon. Great Red is a being people just see but is not actually there. He makes people have dreams of what they most desire when they are around him and he himself is actually a dream. He exists, yet doesn't.

Why do you think Ophis and Great Red can live in the Dimensional Gap just fine. Because the law of that dimension does not apply to the side that does not exist within great red and ophis. I'm pretty sure Issei was also said to be a being who shouldn't exist yet he does; being called a mini great red. That just gives point to this and doesn't mean issei is a conceptual being; though you could technically say he is. Body and life force of two dragon gods, but the soul of a reincarnated devil.