The Strongest Red Emperor Dragon in History

Ophis, Great Red, and Trihexa is the strongest being in existence that is feared by other creatures, be it human, devil, fallen angel, angel, god and even dragons no one dares to fight the three of them. But what happens if there are being besides the three of them! This tells Mc as Promodial Azure Dragon the strongest being in existence. Mc x Harem (DXD characters are not mine).