User blog comment:B214/Volume 21 info & spoilers/@comment-82.199.215.185-20160522174633/@comment-1359322-20160523073933

Okay just to hand in a brief update:

From n0m@n:

""Naturally. That's a monster who can stand on his own against Great Red who is the God of Dragons so his powers are beyond our imagination.""

But be noted, it's God of Dragons not Dragon God. And this may be just Ise's perception because in Volume 11 he thought of this:

", she doesn’t seem like a being that is called God of Dragons. Great-Red looks more like a God of Dragons instead. Just like Kiba said, maybe she changed because she stayed in this world too long. I think I'm beginning to understand why Sensei gained an interest in her. This Dragon called Ophis must be a being filled with many doubts. And that Dragon-God has taken an interest in me…. I took a glimpse at Ophis, and like I thought she was staring right at me. What on earth is she trying to gain from me? Just like that, the group study continued while the Dragon of Infinity remained."

So Ise may just be pushing his own thoughts rather than it being an actual class. I will still use this as the main referral since it's directly from the author himself. So unless Ishibumi changes it, Great Red's class as a True Dragon won't change.